Tschermakite information

Tschermakite
Tschermakite
	Anyolite, a metamorphic rock: chrome-zoisite (bright green), tschermakite (black), ruby (red)
General
Category	Silicate mineral (amphibole)
Formula; (repeating unit)	☐Ca2(Mg3Al2)(Si6Al2)O22(OH)2
IMA symbol	Tsr
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

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

[1] 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-2] Handbook of Mineralogy

[Mindat-3] Mindat.org

[Webmin-4] Webmineral data

[5] IMA Master List

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