This science ClipArt gallery offers 220 illustrations of crystals of numerous minerals. These crystalline minerals are created through natural processes, and so often times there are numerous crystal shapes for any given mineral (polycrystalline materials).

A calcite crystal

Calcite

A calcite crystal

This illustration shows calcite crystals. They are hexagonal-rhombohedral, though actual calcite rhombohedrons are rare as natural crystals.

Calcite Crystals

This illustration shows calcite crystals. They are hexagonal-rhombohedral, though actual calcite rhombohedrons…

Cassiterite.

Cassiterite

Cassiterite.

"Tetragonal. Common forms are prisms and pyramids of first and second orders." — Ford, 1912

Cassiterite

"Tetragonal. Common forms are prisms and pyramids of first and second orders." — Ford, 1912

Cassiterite is a tin oxide mineral, SnO<sub>2</sub>. It is generally opaque but is translucent in thin crystals. Its luster and multiple crystal faces produce a desirable gem. Cassiterite is the chief ore of tin today.

Cassiterite

Cassiterite is a tin oxide mineral, SnO2. It is generally opaque but is translucent in thin crystals.…

Cassiterite is a tin oxide mineral, SnO<sub>2</sub>. It is generally opaque but is translucent in thin crystals. Its luster and multiple crystal faces produce a desirable gem. Cassiterite is the chief ore of tin today.

Cassiterite

Cassiterite is a tin oxide mineral, SnO2. It is generally opaque but is translucent in thin crystals.…

Cassiterite is a tin oxide mineral, SnO<small><sub>2</sub></small>. It is generally opaque but is translucent in thin crystals. Its luster and multiple crystal faces produce a desirable gem. Cassiterite is the chief ore of tin today.

Cassiterite

Cassiterite is a tin oxide mineral, SnO2. It is generally opaque but is translucent in thin crystals.…

Celestite.

Celestite

Celestite.

"Orthorhombic. Crystals resemble closely those of barite. Commonly tabular parallel to the base or prismatic parallel to the brachy- or macro-axis with prominent development of the domes. Crystals which are elongated parallel to the brachy-axis are frequently terminated in front by four faces in nearly equal development, consisting of 2 prism faces and 2 of the macrodome." &mdash; Ford, 1912

Celestite

"Orthorhombic. Crystals resemble closely those of barite. Commonly tabular parallel to the base or prismatic…

"A crystal has a center of symmetry if an imaginary line is passed from some point on its surface through its center, and a similar point is found on the line at an equal distance beyond the center." &mdash; Ford, 1912

Symmetry center

"A crystal has a center of symmetry if an imaginary line is passed from some point on its surface through…

"Habit varied and crystal show many forms. Crystals often tabular parallel to brachypinacoid." &mdash; Ford, 1912

Cerussite

"Habit varied and crystal show many forms. Crystals often tabular parallel to brachypinacoid." —…

Chabazite.

Chabazite

Chabazite.

"Hexagonal-rhombohedral. Common form is the simple rhombohedron, r, having nearly cubic angles. May show several different rhombohedrons." &mdash; Ford, 1912

Chabazite

"Hexagonal-rhombohedral. Common form is the simple rhombohedron, r, having nearly cubic angles. May…

Chalcanthite.

Chalcanthite

Chalcanthite.

"Orthorhombic. Usually in small tabular crystals with hexagonal outline. Striated parallel to the brachy-axis." &mdash; Ford, 1912

Chalcocite

"Orthorhombic. Usually in small tabular crystals with hexagonal outline. Striated parallel to the brachy-axis."…

"Orthorhombic. Usually in small tabular crystals with hexagonal outline. Striated parallel to the brachy-axis. Often twinned in pseudohexagonal forms." &mdash; Ford, 1912

Chalcocite

"Orthorhombic. Usually in small tabular crystals with hexagonal outline. Striated parallel to the brachy-axis.…

"A drawing of a crystal showing a combination of the cube, octahedron and rhombic dodecahedron is shown, in which the faces are lettered the same as the corresponding poles in the projection." -The Encyclopedia Britannica 1910

Clinographic Drawing of a Cubic Crystal

"A drawing of a crystal showing a combination of the cube, octahedron and rhombic dodecahedron is shown,…

"Orthohombic. Habit of crystals is short prismatic; often in square prisms because of prominent development of the vertical pinacoids. Terminated by basal plane, pyramids and domes; frequently complex." &mdash; Ford, 1912

Columbite

"Orthohombic. Habit of crystals is short prismatic; often in square prisms because of prominent development…

Corundum.

Corundum

Corundum.

Corundum.

Corundum

Corundum.

"Hexagonal-rhombohedral. Crystals usually prismatic in habit or tapering hexagonal pyramids." &mdash; Ford, 1912

Corundum

"Hexagonal-rhombohedral. Crystals usually prismatic in habit or tapering hexagonal pyramids." —…

"Hexagonal-rhombohedral. Crystals usually prismatic in habit or tapering hexagonal pyramids." &mdash; Ford, 1912

Corundum

"Hexagonal-rhombohedral. Crystals usually prismatic in habit or tapering hexagonal pyramids." —…

An illustration of a crystal showing triangular markings.

Crystal

An illustration of a crystal showing triangular markings.

"...represents a crystal of augite bounded by th clino-pinacoid, the ortho-pinacoid, a prism, and a hemi-pyramid." -The Encyclopedia Britannica 1910

Crystal of Augite

"...represents a crystal of augite bounded by th clino-pinacoid, the ortho-pinacoid, a prism, and a…

"Here there is only a [center] of symmetry. All the forms are pina-coids, each consisting of only two paarallel faces." -The Encyclopedia Britannica 1910

Crystal of Axinite

"Here there is only a [center] of symmetry. All the forms are pina-coids, each consisting of only two…

"...a combination of two bisphenoids (P and P'), two bipyramids of the second order (b and c), and the basal pinacoid (a)." -The Encyclopedia Britannica 1910

Crystal of Chalcopyrite

"...a combination of two bisphenoids (P and P'), two bipyramids of the second order (b and c), and the…

"...represents a crystal of dioptase with the fundamental rhombohedron (r) and the hexagonal prism of the second order (m) combined with the rhombohedron (s)." -The Encyclopedia Britannica 1910

Crystal of Dioptase

"...represents a crystal of dioptase with the fundamental rhombohedron (r) and the hexagonal prism of…

"...a combination of tetragonal prism of the first order with a tetragonal bipyramid of the third order and the basal pinacoid." -The Encyclopedia Britannica 1910

Crystal of Fergusonite

"...a combination of tetragonal prism of the first order with a tetragonal bipyramid of the third order…

"...a combination of the brachy-pinacoid and a prism, with the pedion, two brachy-domes and two marco-domes at the upper end, and a pyramid at the lower end." -The Encyclopedia Britannica 1910

Crystal of Hemmorphite

"...a combination of the brachy-pinacoid and a prism, with the pedion, two brachy-domes and two marco-domes…

Holohedral orthorhombic combination

Crystal of Hypersthene

Holohedral orthorhombic combination

"...represents a crystal of tourmaline wit the trigonal prism, hexagonal prism, and a trigonal pyramid at each end." -The Encyclopedia Britannica 1910

Crystal of Tourmaline

"...represents a crystal of tourmaline wit the trigonal prism, hexagonal prism, and a trigonal pyramid…

"...shows the actual shape of a crystal of ziron from Ceylon" -The Encyclopedia Britannica 1910

Crystal of Zircon (actual)

"...shows the actual shape of a crystal of ziron from Ceylon" -The Encyclopedia Britannica 1910

"...the ideally developed form [of a zircon crystal]. The crystal is a combination of five simple forms: two tetragonal prisms, two tetragonal bipyramids, and one ditetragonal bipyramid." -The Encyclopedia Britannica 1910

Crystal of Zircon (ideal)

"...the ideally developed form [of a zircon crystal]. The crystal is a combination of five simple forms:…

A beryl crystal, an example of a basal pinacoid.

Beryl crystal

A beryl crystal, an example of a basal pinacoid.

A beryl crystal, an example of a basal pinacoid.

Beryl crystal

A beryl crystal, an example of a basal pinacoid.

A beryl crystal, an example of a basal pinacoid.

Beryl crystal

A beryl crystal, an example of a basal pinacoid.

A beryl crystal, an example of a basal pinacoid.

Beryl crystal

A beryl crystal, an example of a basal pinacoid.

"The forms present upon it are two pyramids of different slope but each intersecting all three of the crystal axes when properly extended. The lower pyramid intersects the two horizontal axes at distances which are proportional to their unit lengths and if it was extended as shown by the dotted lines would also cut the vertical axis at a distance proportional to its unit length." &mdash; Ford, 1912

Sulphur crystal

"The forms present upon it are two pyramids of different slope but each intersecting all three of the…

"...take any three edges formed by the intersection of three faces of a crystal. These axes are called the crystallographic axes, and the planes in which they lie are the axial planes. A fourth face on the crystal intersecting these three axes in the points A, B, C is taken as the parametral plan, and the lengths OA:OB:OC are the parameters of the crystal." -The Encyclopedia Britannica 1910

Crystallographic Axes of Reference

"...take any three edges formed by the intersection of three faces of a crystal. These axes are called…

Forms of crystals.

Crystals, Forms of

Forms of crystals.

"A combination of dodecahedron and cube." &mdash; Ford, 1912

Cube and dodecahedron

"A combination of dodecahedron and cube." — Ford, 1912

"A combination of cube and hexoctahedron." &mdash; Ford, 1912

Cube and hexoctahedron

"A combination of cube and hexoctahedron." — Ford, 1912

"A combination of cube and pyritohedron, in which it will be noted that the faces of the pyritohedron trunctuate unsymmetrically the edges of the cube." &mdash; Ford, 1912

Cube and pyritohedron

"A combination of cube and pyritohedron, in which it will be noted that the faces of the pyritohedron…

"A cube with its edges beveled by the faces of a tetrahexahedron." &mdash; Ford, 1912

Cube and tetrahexahedron

"A cube with its edges beveled by the faces of a tetrahexahedron." — Ford, 1912

"A combination of cube and trapezohedron." &mdash; Ford, 1912

Cube and trapezohedron

"A combination of cube and trapezohedron." — Ford, 1912

A cube, octahedron, and dodecahedron.

Cube, octahedron and dodecahedron

A cube, octahedron, and dodecahedron.

"Monoclinic. Habit varied. Crystals usually nearly equidimensional in the three axial directions and often complex in development." &mdash; Ford, 1912

Datolite

"Monoclinic. Habit varied. Crystals usually nearly equidimensional in the three axial directions and…

"Curved faces of the hexoctahedron are frequently observed." &mdash; Ford, 1912

Diamond

"Curved faces of the hexoctahedron are frequently observed." — Ford, 1912

Diamond.

Diamond

Diamond.

"Pure crystalline carbon, the hardest substance known, possessing great lustre owing to its great refracting power." &mdash; Williams, 1889

Diamond

"Pure crystalline carbon, the hardest substance known, possessing great lustre owing to its great refracting…

The diamond is cut to show the stone's brilliance, creating different parts to the cut: table, crown, girdle, pavilion, culet.

Diamond Cut

The diamond is cut to show the stone's brilliance, creating different parts to the cut: table, crown,…

Various types of square cut diamonds. Top row: Old square cut diamonds. Bottom row: English square cut diamonds.

Square Cut Diamonds

Various types of square cut diamonds. Top row: Old square cut diamonds. Bottom row: English square cut…

Diopside is a monoclinic pyroxene mineral with composition MgCaSi<small><sub>2</sub></small>O<small><sub>6</sub></small>. It forms complete solid solution series with hedenbergite (FeCaSi<small><sub>2</sub></small>O<small><sub>6</sub></small>) and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull green crystals in the monoclinic prismatic class. It has two distinct prismatic cleavages at 87 and 93&deg; typical of the pyroxene series. It has a Mohs hardness of six and a Vickers hardness of 7.7.

Diopside

Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution…

Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral. It is transparent to translucent. Its luster is vitreous to sub-adamantine. Its formula is CuSiO<small><sub>3</sub></small>&sdot;H<small><sub>2</sub></small>O (also reported as CuSiO<small><sub>2</sub></small>(OH)<small><sub>2</sub></small>). It has a hardness of 5, the same as tooth enamel. It specific gravity is 3.28&ndash;3.35, and it has two perfect and one very good cleavage directions. Additionally, dioptase is very fragile and specimens must be handled with great care. It is a trigonal mineral, forming 6-sided crystals that are terminated by rhombohedra.

Dioptase

Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral. It is transparent…

"The faces of the deltoid dodecahedron correspond to one-half those of the trisoctahedron." &mdash; Ford, 1912

Deltoid dodecahedron

"The faces of the deltoid dodecahedron correspond to one-half those of the trisoctahedron." —…

"...shows two crystals of tartaric acid, a a right-handed crystal of dextro-tartaric acid, and b a left-handed crystal of laevo-tartaric acid. The two crystals are enantimorphous." -The Encyclopedia Britannica 1910

Enantimorphous Crystals of Tartaric Acid

"...shows two crystals of tartaric acid, a a right-handed crystal of dextro-tartaric acid, and b a left-handed…

"Monoclinic. Crystals are often much elongated parallel to the ortho-axis with a prominent development of the faces of the orthodome zone, giving them a prismatic aspect. Striated parallel to the ortho-axis. Terminated usually at one end of the ortho-axis and most commonly by the two faces of a pyramid." &mdash; Ford, 1912

Epidote

"Monoclinic. Crystals are often much elongated parallel to the ortho-axis with a prominent development…

"Positive and negative extinction angles in the feldspars." -Johannsen, 1908

Extinction Angles

"Positive and negative extinction angles in the feldspars." -Johannsen, 1908

Ferrocolumbite, also called niobite, niobite-tantalite, columbate and columbite [(Fe, Mn)(Nb, Ta)2O6] is a black mineral that is an ore of niobium and tantalum. It has a submetallic luster and a high specific gravity and is a niobate of iron and manganese, containing tantalate of iron. This mineral was first found at Haddam, Middlesex County, Connecticut in New England, USA. It forms a series with the tantalum-dominant analogue Ferrotantalite and one with the manganese-dominant analogue Manganocolumbite.

Ferrocolumbite

Ferrocolumbite, also called niobite, niobite-tantalite, columbate and columbite [(Fe, Mn)(Nb, Ta)2O6]…

"Isometric. Common forms dodecahedron amd trapezohedron, often in combination." &mdash; Ford, 1912

Garnet

"Isometric. Common forms dodecahedron amd trapezohedron, often in combination." — Ford, 1912