Ferro-actinolite
܆Ca2(Mg2.5-0.0Fe2+2.5-5.0)Si8O22(OH)2IMA symbol: Factredefined
Ferro-actinolite is a silicate mineral with the formula ܆Ca2(Mg2.5-0.0Fe2+2.5-5.0)Si8O22(OH)2, crystallizing in the monoclinic system. It has a Mohs hardness of 5.5, a calculated density of 3.361 g/cm3.
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 9.986, b = 18.296, c = 5.306; α = 90, β = 104.79, γ = 90 |
| Cell volume | 937.308 ų, Z = 2 |
| Axial ratios | 0.5458:1:0.2900calculated from COD 9001939 |
| Source structure | COD 9001939 (American Mineralogist, 1998) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 8.539 | 2.735 | 3.17 | 2.551 | 2.621 | 2.368 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 54.4 | 36.3 | 30.3 | 22.5 | 20.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9001939; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.361 g/cm³calculated from COD 9001939 |
|---|---|
| Hardness (Mohs) | 5.5single sourceWikidata (CC0) |
Classification
| Nickel-Strunz (10th) | 9.DE.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DE.10Wikidata (CC0) |