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Vitreous, Pearly
4½ - 5
From the Greek for "away from" (ἀπό, apo) and "leaf" (φύλλον, phyllos), in allusion to the way it exfoliates upon heating.

Classification of Apophyllite

Physical Properties of Apophyllite

Vitreous, Pearly
Hardness (Mohs):
4½ - 5
2.33 - 2.37 g/cm3 (Measured)    2.37 g/cm3 (Calculated)

Optical Data of Apophyllite

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:

Crystallography of Apophyllite

Crystal System:

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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Edge Lines | Miller Indicies | Axes

Opaque | Translucent | Transparent

Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Other Names for Apophyllite

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:
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 URL:
Please feel free to link to this page.
The following Apophyllite specimens are currently listed for sale on

Localities for Apophyllite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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