Apophyllite
Apophyllite is a mineral group known for its transparent, glassy crystals and pyramid-like shapes. It is commonly found in volcanic rocks and is popular among collectors for its clarity and reflective surfaces. Although sometimes used decoratively, it is not a durable gemstone for jewelry.

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Apophyllite

Apophyllite is a naturally occurring mineral group composed mainly of hydrated potassium calcium silicate fluoride. Its general chemical formula is KCa₄Si₈O₂₀(F,OH)·8H₂O. It belongs to the phyllosilicate mineral group and crystallizes in the tetragonal crystal system. Apophyllite is well known for forming beautiful, well-defined crystals, often in pyramidal or cubic shapes, with highly reflective surfaces. The mineral is typically colorless or white, but it can also appear in shades of green, pink, or yellow depending on trace elements. Transparent to translucent crystals with a strong vitreous (glass-like) luster are especially prized by collectors. Some specimens display a pearly sheen on cleavage surfaces, enhancing their visual appeal.

Physical & Chemical Properties

NameApophyllite
Scientific NameApophyllite
Mineral GroupPhyllosilicate
Hardness (Mohs)4.5 – 5
ColorColorless, white, green, pink
OriginIndia (especially Maharashtra), Brazil, Mexico, Iceland, USA
Chemical FormulaKCa₄Si₈O₂₀(F,OH)·8H₂O

Quick Facts

Crystal SystemTetragonal
Specific Gravity2.3 – 2.4
BirthstoneNone
Refractive Index1.53 – 1.54
Optical CharacterUniaxial
DispersionLow
Major SourcesIndia (especially Maharashtra), Brazil, Mexico, Iceland, USA
TreatmentsApophyllite is almost always natural and untreated
Price RangeDue to its softness and perfect cleavage, Apophyllite is not suitable for everyday jewelry and is mainly used as a display or collector’s mineral.
Care InstructionsHandle gently to avoid breakage Avoid water exposure (can damage structure) Clean with dry or soft cloth only Keep away from chemicals and heat
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