Howlite
Howlite is a mineral with the chemical formula Ca2B5SiO9(OH)5·H2O. It has a Mohs hardness of 3.5 - 4 and waxy to dull luster.
Howlite properties
| Type | Mineral |
|---|---|
| Chemical formula | Ca2B5SiO9(OH)5·H2O |
| Mohs hardness | 3.5 - 4 |
| Luster | Waxy to dull |
| Typical colors | White to light blue or gray, often with black or brown veins |
| Formation | Typically found in sedimentary deposits and often associated with other minerals in evaporite deposits |
| Rarity | 4 / 10 |
Mohs hardness 3.5–4 — soft
1 · Talc5 · Apatite10 · Diamond
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