1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
ARAGONITE, one of the mineral forms of calcium carbonate (CaCOj), the other form being the more common mineral calcite. It crystallizes in the orthorhombic system, and the crystals are either prismatic or acicular in habit. Simple crystals are, however, rare; twinning on the prism planes (M in the figures) being a characteristic feature of the mineral (fig. i). This twinning is usually often repeated on the same plane (fig. 2), and gives rise to striations on the terminal faces (k) of the crystals; often, also, thr…
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- Vol. 2, pp. 314-314