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pectolite
Science; General science
A mineral inosilicate with composition Ca 2 NaSi 3 O 8 (OH), crystallizing in the triclinic system. Crystals are usually acicular in radiating aggregates (see illustration ). ...
wollastonite
Science; General science
A mineral inosilicate with composition CaSiO 3 . It crystallizes in the triclinic system in tabular crystals (see illus. ). More commonly it is massive, or in cleavable to ...
rhodonite
Science; General science
A mineral inosilicate with composition MnSiO 3 . Rhodonite crystallizes in the triclinic system in crystals that are commonly tabular parallel to the base (see illus. ). More ...
datolite
Science; General science
A mineral neosilicate, composition CaBSiO 4 (OH), crystallizing in the monoclinic system. It usually occurs in crystals showing many faces and having an equidimensional habit. ...
fluorite
Science; General science
A mineral of composition CaF 2 and an important structure type with space group Fm3m, cell edge = 0.546 nm. The fluorite structure type is written RX 2 , where the R ...
turquoise
Science; General science
A mineral of composition CuAl 6 (PO 4 ) 4 (OH) 8 · 5H 2 O in which considerable ferrous ion (Fe 2+ ) may substitute for copper. Ferric ion (Fe 3+ ) may also substitute for part ...
alunite
Science; General science
A mineral of composition KAl 3 (SO 4 ) 2 (OH) 6 . Alunite occurs in white to gray rhombohedral crystals or in fine-grained, compact masses. It has a hardness of 4 and a specific ...
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