General Information:
Chemical Formula:
Ca(C2O4)·(H2O)
Composition:
(Molecular Weight = 146.11 gm)
Calcium 27.43 % Ca
Hydrogen 1.38 % H
Carbon 16.44 % C
Oxygen 54.75 % O
Empirical Formula:
CaC2O4·(H2O)
Environment:
The mineral is deposited from low temperature hydrothermal solutions which have come into contact with carboniferous lithologies, releasing methane, such as in graphitic schists or, primarily, from areas surrounding coa
IMA Status:
Approved IMA 1962
Locality:
The classic locality occurs in the anthracite deposits of the Doehlener Basin of Freital and Burgk, where clear crystals of up to 2 cm, mostly twinned, are found in association with ca lcite, pyrite, markesite, limonite and ga
Name Origin:
Named after the British mineralogist, crystallographer and natural philosopher William Whewell (1794-1866),
Physical Properties:
Cleavage:
[101] Good, [010] Good, [110] Good
Color:
brownish, colorless, gray, yellow, or yellow brown.
Density:
2.21 - 2.23, Average = 2.21
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Prismatic - Crystals Shaped like Slender Prisms (e.g. t ourmaline).
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
Fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
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