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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 URL:
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Physical Properties of Apophyllite

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

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)
3d models and HTML5 code kindly provided by

Edge Lines | Miller Indicies | Axes

Opaque | Translucent | Transparent

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

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:

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, Pete J., R.C. Rouse & J.A. Norberg (1978), Hydroxyapophyllite, a new mineral and a redefinition of the apophyllite group: Am. Min.: 63: 196-202.

Internet Links for Apophyllite

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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