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Apophyllite is a general term for three minerals that are similar in their chemistry and physical properties; Fluorapophyllite, Hydroxyapophyllite, and Natroapophyllite. Apophyllite is a secondary mineral that forms in cavities of igneous rocks. The name comes from the Greek words apo (from) and fyllo (leaf) because apophyllite exfoliates or extends when burned.
Chemistry
(K,Na)Ca4Si8O20(F,OH) 8H2O -
Hydrated Potassium Calcium Sodium Silicate Fluoride Hydroxide
Class:
Silicates
Subclass:
Phyllosilicates
Group:
Apophyllite
Crystal:
Tetragonal - Ditetragonal Dipyramidal
Color:
White, Pink, Green, Yellow, Violet
Streak:
White
Luster:
Vitreous - Pearly
Diaphaneity:
Transparent to translucent
Density:
2.3 - 2.4
Hardness:
4 - 5
Cleavage:
Perfect
Fracture:
Uneven
Morphology:
Prismatic and tabular crystals, lameller aggregates, massive.
Luminescence:
Non-fluorescent
Frequency:
Uncommon
Origin:
Hydrothermal in cavities in volcanic rocks, along cracks in the Alpine-type veins and pegmatites.
Occurence:
Jalagon and Poona,, India; Centreville and Fairfax Virginia, USA; Germany; Rio Grande do Sul, Brazil.
Application:
Mineral Specimen
Apophyllite Gallery
Metaphysical Properties

 
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