mineral
Prehnite with Epidote inclusions
Prehnite - Ca2Al(AlSi3O10)(OH)2; Epidote - Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH)
Hardness: 6-6.5 (Prehnite); Color: Pale green to yellow-green; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 2.80-2.95
- Hardness
- 6-6
- Color
- Pale green to yellow-green
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Prehnite); Color: Pale green to yellow-green; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 2.80-2.95
Formation & geological history
Prehnite is a secondary or hydrothermal mineral occurring in cavities and fractures of mafic volcanic rocks like basalt. It often forms as botryoidal masses with needle-like Epidote inclusions.
Uses & applications
Used primarily in jewelry as cabochons, as a collector specimen, and in metaphysical practices.
Geological facts
Prehnite was the first mineral to be named after an individual, Colonel Hendrik Von Prehn, in 1788. It is often called 'Grape Jade' due to its common botryoidal (grape-like) habit.
Field identification & locations
Identify by the distinct pale green translucent color and characteristic black or dark green needle-like inclusions of Epidote. Commonly found in South Africa, Australia, and the USA.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock