Titanite
CaTi(SiO4)OIMA symbol: Ttnapproved
Titanite is a silicate mineral with the formula CaTi(SiO4)O, crystallizing in the monoclinic system. It has a Mohs hardness of 5-5.5, typically brown, gray, green or rose in color, with an adamantine or resinous luster, a specific gravity of 3.4-3.56. Its streak is white or green.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | A 1 2/a 1 |
| Cell (Å, °) | a = 7.0541, b = 8.6925, c = 6.5445; α = 90, β = 113.903, γ = 90 |
| Cell volume | 366.876 ų, Z = 4 |
| Axial ratios | 0.8115:1:0.7529calculated from COD 9005414 |
| Source structure | COD 9005414 (European Journal of Mineralogy, 1999) — 1 of 116 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.239 | 2.992 | 2.608 | 2.59 | 1.643 | 1.494 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 73.9 | 62.7 | 42 | 26.4 | 20.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9005414; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.517 g/cm³calculated from COD 9005414 |
|---|---|
| Hardness (Mohs) | 5.5single sourceWikidata (CC0) 5-5.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.4-3.56 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, gray, green, rose, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | green, red, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 196.03 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 20.45%, Ti 24.42%, Si 14.33%, O 40.81% |
Classification
| Nickel-Strunz (10th) | 9.AG.15Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.AG.15Wikidata (CC0) |