Properties
| Category | Nesosilicate |
|---|---|
| Formula | CaTiSiO5 |
| Crystal system | Monoclinic |
| Color | Reddish brown, brown, gray, black, yellow, green, or red, colourless |
| Crystal habit | Flattened wedge-shaped crystals, also massive |
| Cleavage | Distinct on , parting on {221} |
| Fracture | Sub-conchoidal |
| Mohs scale hardness | 5–5.5 |
| Luster | Sub-adamantine tending to slightly resinous |
| Streak | Reddish white |
| Diaphaneity | Translucent to transparent |
| Specific gravity | 3.48–3.60 |
From the Wikipedia article
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.
Source
Source record: crystal-compendium/sphene/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Titanite — revision id 1376524084. Text and properties from Wikipedia, licensed CC BY-SA 4.0.