Mineral atlas / Species record
Prehnite
- Chemical formula (IMA record)
- Ca₂Al(Si₃Al)O₁₀(OH)₂
- Recognition status
- Grandfathered
- Original-description year in master list
- 1788
- First-discovery country (IMA)
- South Africa
- Crystal system
- Not supplied in the IMA master list
- Mohs hardness
- Not supplied in the IMA master list
- Measured density
- Not supplied in the IMA master list
- Historical discoverer
- Not supplied in the IMA master list
How it occurs in nature
This species has a documented chemistry and recognition record in the IMA catalog. The master list does not describe its formation environment. Consult the cited mineral-description studies below for species-specific occurrence and geological context; these cannot be inferred reliably from the formula alone.
Related gem names
Discovery & scientific record
The country refers to the master list’s first-discovery country, using modern borders. It is not a list of all deposits. A question mark is retained when the source is uncertain; a special-procedure date can refer to redefinition rather than discovery.
Original reference: Journal of Mineralogy 38 (2026), 117 Schriften der Gesellschaft Naturforschender Freunde zu Berlin 8 (1788), 211
Additional reference: Mineralogy and Petrology 112 (2018), 173
IMA-CNMNC master list · page 177 ↗
RRUFF · further mineral research ↗ · Handbook of Mineralogy ↗
Catalog coverage and profile depth are different: every species in the cited IMA edition is indexed, but this edition does not provide every physical property or a full discovery narrative. The archive leaves those gaps explicit. Formulae and references are adapted from the IMA list under CC BY-SA 3.0; consult the original page for authoritative typography.