mineral
Apophyllite cluster
Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O
Hardness: 4.5-5 (Mohs scale); Color: Clear to white; Luster: Vitreous to pearly; Crystal structure: Tetragonal; Cleavage: Perfect one-way (basal cleavage); SG: 2.3-2.4.
- Hardness
- 4
- Color
- Clear to white
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 4.5-5 (Mohs scale); Color: Clear to white; Luster: Vitreous to pearly; Crystal structure: Tetragonal; Cleavage: Perfect one-way (basal cleavage); SG: 2.3-2.4.
Formation & geological history
Formed as secondary minerals in amygdules or cavities of basaltic volcanic rocks through hydrothermal processes, often associated with zeolites.
Uses & applications
Popular collector specimen, occasionally used in metaphysical practices; too soft for most jewelry apart from protected settings.
Geological facts
The name comes from the Greek word 'apophyllizein', meaning 'to flake off', referring to its tendency to exfoliate or flake when heated. It often forms beautiful cubic or pyramidal crystals.
Field identification & locations
Identify in the field by its pearly luster on cleavage faces and its association with minerals like Stilbite or Heulandite in basalt cavities. Common locations include the Deccan Traps in India.
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