Properties
| Category | Sorosilicates |
|---|---|
| Formula | Zn4Si2O7(OH)2·H2O |
| Crystal system | Orthorhombic |
| Color | White, grey, blue |
| Crystal habit | Polar crystals, with different or hemimorphic ends. Also coxcomb masses, mammillary, stalactitic, or massive |
| Cleavage | Perfect on {110}, poor on {101}, {001} rare |
| Fracture | Uneven to conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 4.5–5 |
| Luster | Vitreous, adamantine, rarely silky |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 3.516–3.525 |
From the Wikipedia article
Hemimorphite is the chemical compound Zn4(Si2O7)(OH)2·H2O, a component of mineral calamine. It is a silicate mineral which, together with smithsonite (ZnCO3), has been historically mined from the upper parts of zinc and lead ores. Both compounds were originally believed to be the same mineral and classified as calamine. In the second half of the 18th century, it was discovered that these two different compounds were both present in calamine. They closely resemble one another.
Source
Source record: crystal-compendium/hemimorphite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Hemimorphite — revision id 1359819981. Text and properties from Wikipedia, licensed CC BY-SA 4.0.