Tremolite

܆Ca₂(Mg_5.0-_4.5Fe₂+_0.0-_0.5)Si₈O₂₂(OH)₂IMA symbol: Trredefined

Tremolite is a silicate mineral with the formula ܆Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2, crystallizing in the monoclinic system. It has a calculated density of 2.987 g/cm3. Its streak is white.

Photos

Crystallography

Crystal system	monoclinic crystal systemWikidata (CC0)
Space group	C 1 2/m 1
Cell (Å, °)	a = 9.84174, b = 18.05932, c = 5.27876; α = 90, β = 104.732, γ = 90
Cell volume	907.378 Å³, Z = 2
Axial ratios	0.5450:1:0.2923calculated from COD 9010497
Source structure	COD 9010497 (American Mineralogist, 2008) — 1 of 23 structures

Powder X-ray diffraction (calculated)

d (Å)	2.706	8.42	3.125	2.534	3.381	9.03
I/I₀	100	69.8	64.7	56.6	51.9	40.4

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010497; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)	2.987 g/cm³calculated from COD 9010497
Streak	whitesingle sourceWikidata (CC0)

Classification

Nickel-Strunz (10th)	9.DE.10Wikidata (CC0)
Nickel-Strunz (9th)	9.DE.10Wikidata (CC0)
Dana (8th)	66.1.3a.1Wikidata (CC0)