Spurrite
Ca5(SiO4)2(CO3)IMA symbol: Spugrandfathered
Spurrite is a silicate mineral with the formula Ca5(SiO4)2(CO3). It has a Mohs hardness of 5, typically colorless, blue, gray or yellow in color, with an earthy or vitreous luster, a specific gravity of 3.81-3.9. Its streak is white.
Photos
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Crystallography
| Space group | P 1 21/a 1 |
|---|---|
| Cell (Å, °) | a = 10.484, b = 6.712, c = 14.156; α = 90, β = 101.27, γ = 90 |
| Cell volume | 976.93 ų, Z = 4 |
| Axial ratios | 1.5620:1:2.1091calculated from COD 9004961 |
| Source structure | COD 9004961 (The Canadian Mineralogist, 2005) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.699 | 2.707 | 2.647 | 2.717 | 2.671 | 2.621 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 93.2 | 88.4 | 88.3 | 88 | 70.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004961; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.023 g/cm³calculated from COD 9004961 |
|---|---|
| Hardness (Mohs) | 5single sourceWikidata (CC0) 5single sourceDana's System, 2nd Appendix (1909) |
| Specific gravity | 3.81-3.9 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | blue, colorless, gray, yellowsingle sourceDana's System, 2nd Appendix (1909) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | earthy, vitreoussingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 444.57 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 45.08%, Si 12.64%, O 39.59%, C 2.7% |
Classification
| Nickel-Strunz (10th) | 9.AH.15Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.AH.15Wikidata (CC0) |
| Dana (8th) | 53.1.1.1Wikidata (CC0) |