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Titanite, or sphene (from Ancient Greek σφηνώ (sphēnṓ) 'wedge'), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.
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sphene mineral also crystals titanium calcium crystal brown green transparent iron properties nesosilicate name used commonly present colour gray black
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Titanite | 2V angle | 17–40° (measured) | 1.00 | infobox |
| Titanite | Birefringence | δ = 0.100–0.160 | 1.00 | infobox |
| Titanite | Category | Nesosilicate | 1.00 | infobox |
| Titanite | Cleavage | Distinct on , parting on {221} | 1.00 | infobox |
| Titanite | Colour | Reddish brown, brown, gray, black, yellow, green, or red, colourless | 1.00 | infobox |
| Titanite | Crystal class | Prismatic (2/m) (same H–M symbol) | 1.00 | infobox |
| Titanite | Crystal habit | Flattened wedge-shaped crystals, also massive | 1.00 | infobox |
| Titanite | Crystal system | Monoclinic | 1.00 | infobox |
| Titanite | Diaphaneity | Translucent to transparent | 1.00 | infobox |
| Titanite | Dispersion | r > v strong | 1.00 | infobox |
| Titanite | Formula | .mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:l… | 1.00 | infobox |
| Titanite | Fracture | Sub-conchoidal | 1.00 | infobox |
| Titanite | IMA symbol | Ttn | 1.00 | infobox |
| Titanite | Luster | Sub-adamantine tending to slightly resinous | 1.00 | infobox |
| Titanite | Mohs scale hardness | 5–5.5 | 1.00 | infobox |
| Titanite | Optical properties | Biaxial (+); very high relief | 1.00 | infobox |
| Titanite | Other characteristics | Radioactive – may be metamict | 1.00 | infobox |
| Titanite | Pleochroism | Strong: X = nearly colorless; Y = yellow to green; Z = red to yellow-orange | 1.00 | infobox |
| Titanite | Refractive index | nα = 1.843–1.950 nβ = 1.870–2.034 nγ = 1.943–2.110 | 1.00 | infobox |
| Titanite | Space group | P21/a | 1.00 | infobox |
| Titanite | Specific gravity | 3.48–3.60 | 1.00 | infobox |
| Titanite | Streak | Reddish white | 1.00 | infobox |
| Titanite | Strunz classification | 9.AG.15 | 1.00 | infobox |
| Titanite | Twinning | Contact and penetration on {100}, lamellar on {221} | 1.00 | infobox |
| Titanite | Unit cell | a = 7.057 Å, b = 8.707 Å c = 6.555 Å; β = 113.81°; Z = 4 | 1.00 | infobox |
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