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Apophyllite

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Colour:
White
Lustre:
Vitreous, Pearly
Hardness:
4½ - 5
Specific Gravity:
2.33 - 2.37
Crystal System:
Tetragonal
Name:
From the Greek for "away from" (ἀπό, apo) and "leaf" (φύλλον, phyllos), in allusion to the way it exfoliates upon heating.

Physical Properties of Apophyllite

Vitreous, Pearly
Colour:
White
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Density:
2.33 - 2.37 g/cm3 (Measured)    2.37 g/cm3 (Calculated)

Optical Data of Apophyllite

Type:
Uniaxial (+)
RI values:
nω = 1.535 nε = 1.537
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Crystallography of Apophyllite

Crystal System:
Tetragonal

Crystallographic forms of Apophyllite

Crystal Atlas:
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Apophyllite no.4 - Goldschmidt (1913-1926)
Apophyllite no.5 - Goldschmidt (1913-1926)
Apophyllite no.6 - Goldschmidt (1913-1926)
Apophyllite no.18 - Goldschmidt (1913-1926)
Apophyllite no.51 - Goldschmidt (1913-1926)
Apophyllite no.98 - Goldschmidt (1913-1926)
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Synonyms of Apophyllite

Other Language Names for Apophyllite

Varieties of Apophyllite

Chromocyclite

Apophyllite showing coloured interference rings when viewed in convergent polarised light - compare with Leucocyclite (black & white rings).

Common Associates

Associated Minerals Based on Photo Data:
Stilbite464 photos of Apophyllite associated with Stilbite on mindat.org.
Quartz170 photos of Apophyllite associated with Quartz on mindat.org.
Prehnite157 photos of Apophyllite associated with Prehnite on mindat.org.
Calcite156 photos of Apophyllite associated with Calcite on mindat.org.
Heulandite70 photos of Apophyllite associated with Heulandite on mindat.org.
Gyrolite63 photos of Apophyllite associated with Gyrolite on mindat.org.
Analcime58 photos of Apophyllite associated with Analcime on mindat.org.
Scolecite56 photos of Apophyllite associated with Scolecite on mindat.org.
Natrolite55 photos of Apophyllite associated with Natrolite on mindat.org.
Datolite52 photos of Apophyllite associated with Datolite on mindat.org.

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Apophyllite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dunn, P.J., Rouse, R.C., Norberg, J.A. (1978) Hydroxyapophyllite, a new mineral and a redefinition of the apophyllite group. American Mineralogist: 63: 196-202.
Dunn, P.J., Wilson, W.E. (1978) Nomenclature revisions in the apophyllite group: hydroxyapophyllite apophyllite fluorapophyllite. The Mineralogical Record: 9: 95-98.

Internet Links for Apophyllite

mindat.org URL:
https://www.mindat.org/min-283.html
Please feel free to link to this page.
Specimens:
The following Apophyllite specimens are currently listed for sale on minfind.com.

Localities for Apophyllite

Mineral and/or Locality  
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