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| Tschermakite | |
|---|---|
 | |
| General | |
| Category | Silicate mineral (amphibole) |
| Formula (repeating unit) | ☐Ca2(Mg3Al2)(Si6Al2)O22(OH)2 |
| IMA symbol | Tsr[1] |
| Strunz classification | 9.DE.10 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Unit cell | a = 9.762(6) Å b = 17.994(12) Å c = 5.325(6) Å; β = 105.10(8)°; Z = 2 |
| Identification | |
| Color | Medium to dark green to green-black to black, brown (rare) |
| Crystal habit | As prismatic crystals or as reaction rims on other minerals |
| Twinning | Simple or multiple twinning parallel to {100} |
| Cleavage | Perfect on {110} Parting on {100}{001} |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 5–6 |
| Luster | Vitreous |
| Streak | Pale grey-green |
| Diaphaneity | Transparent |
| Specific gravity | 3.15 |
| Optical properties | Biaxial (−) |
| Refractive index | nα = 1.623–1.660 nβ = 1.630–1.680 nγ = 1.638–1.688 |
| Birefringence | δ = 0.015–0.028 |
| Pleochroism | Visible in browns and greens |
| 2V angle | Measured: 60° to 90° |
| References | [2][3][4][5] |
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.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Handbook of Mineralogy
- ^ Mindat.org
- ^ Webmineral data
- ^ IMA Master List