This figure reproduces a combination of orthorhombic forms observed on crystals of aluminum orthosilicate,…

"Orthorhombic. Acicular pyramidal; consisting of a prism terminated by a combination of a very steep…

"Orthorhombic. Tabular; consisting of prominent brachypinacoid faces modified by a prism and a low brachydome."…

This figure exhibits a combination occurring on the ferro-magnesian meta-silicate, Hypersthene. Forms:…

"Orthorhombic. Crystals commonly tabular parallel to basal plane, showing also short prisms and low…

"Orthorhombic. Crystals commonly tabular parallel to basal plane, showing also short prisms and low…

"This is the general form and is bounded by eight scalene triangles." -The Encyclopedia Britannica 1910

"This is the general form and is bounded by eight scalene triangles." -The Encyclopedia Britannica 1910

"general form...bounded by four scalene triangles." -The Encyclopedia Britannica 1910

This is an orthorhombic crystal of olivine. It is formed by the orthorhombic prism in combination with…

"An orthorhombic pyramid has eight triangular faces, each of which intersects all three of the crystallographic…