Tschermakite
A variety of Minerals
What is Tschermakite?
The endmember hornblende tschermakite (☐Ca2(Mg3Al2)(Si6Al2)O22(OH)2) is a calcium rich monoclinic amphibole mineral. It is frequently synthesized along with its ternary solid solution series members tremolite and cummingtonite so that the thermodynamic properties of its assemblage can be applied to solving other solid solution series from a variety of amphibole minerals.
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Key Characteristics
Characteristics of Tschermakite
A hand specimen of tschermakite is green to black in color; its streak will be greenish white. It can be transparent to translucent and has a vitreous luster. Tschermakite shows the characteristic amphibole perfect cleavage on [110]. Its average density is 3.24, with a hardness of 5–6; its fracture will be brittle to conchoidal. In thin section its optic sign and 2V angle cover a wide range and are not very useful for identification. It shows a distinct pleochroism in browns and greens.
Quick Facts
Physical Properties
- Color
- Medium green to dark green to green-black to black, brown (rare).
- Hardness (Mohs)
- 5 - 6
- Density
- 3.25 g/cm³
- Streak
- Pale grey-green
Chemical Properties
- Chemical Formula
- ☐(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2
- Elements
- Al, Ca, H, Mg, O, Si
Also Known As
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