Pigeonite
(Mg,Fe,Ca)2Si2O6IMA symbol: Pgtapproved
Pigeonite is a silicate mineral with the formula (Mg,Fe,Ca)2Si2O6, crystallizing in the monoclinic system. It has a Mohs hardness of 6, a specific gravity of 1.6.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 9.7071, b = 8.9435, c = 5.2481; α = 90, β = 108.483, γ = 90 |
| Cell volume | 432.114 ų, Z = 4 |
| Axial ratios | 1.0854:1:0.5868calculated from COD 9003838 |
| Source structure | COD 9003838 (American Mineralogist, 2005) — 1 of 63 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.017 | 3.207 | 2.489 | 2.575 | 2.903 | 2.917 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 52.1 | 50.7 | 47.7 | 46.7 | 42.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9003838; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.56 g/cm³calculated from COD 9003838 |
|---|---|
| Hardness (Mohs) | 6single sourceWikidata (CC0) |
| Specific gravity | 1.6 g/cm3single sourceDana's System, 2nd Appendix (1909) |
Classification
| Nickel-Strunz (10th) | 9.DA.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DA.10Wikidata (CC0) |