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"Calc-spar occurs at a Scottish locality in acicular pyramidal crystals of which the length may be ten or more times as great as the width." —The Encyclopedia Britannica, 1903

Calc-spar

"Calc-spar occurs at a Scottish locality in acicular pyramidal crystals of which the length may be ten…

"Calc-spar occurs at a Scottish locality in acicular pyramidal crystals." —The Encyclopedia Britannica, 1903

Calc-spar

"Calc-spar occurs at a Scottish locality in acicular pyramidal crystals." —The Encyclopedia Britannica,…

"Calc-spar occurs at a Scottish locality in acicular pyramidal crystals." —The Encyclopedia Britannica, 1903

Calc-spar

"Calc-spar occurs at a Scottish locality in acicular pyramidal crystals." —The Encyclopedia Britannica,…