Apophyllite

Big Photo

India
22.91 carats

Apophyllite is named after Greek "apo" - away and "phyllazein" - to get leaves, alluding to its exfoliation when heated with a blowpipe. They can also be called "fisheye stone".

Apophyllite is popular because of its abundance, colour variety, and well-defined crystals, but easy cleavage, brittleness and extreme heat sensitivity make this material difficult to facet.

Apophyllite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Apophyllite Gemstones by Size

This table shows distribution of Apophyllite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:3.04 cts
Heaviest:22.91 cts
Average:9.23 cts
Total photos:6
Do you have a larger Apophyllite? Why not upload a photo?
3.04ct to 5.03ct5.03ct to 7.01ct7.01ct to 9.00ct9.00ct to 10.99ct10.99ct to 12.98ct12.98ct to 14.96ct14.96ct to 16.95ct16.95ct to 18.94ct18.94ct to 20.92ct20.92ct to 22.91ct
General Information
Chemical Formula
KCa
 
4
Si
 
8
O
 
20
(F,OH) · 8H
 
2
O
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Apophyllite Treatments
Colorless material has been reported by Plough (1957) to turn green on irradiation. Heat could be expected to reverse this change - Nassau, 1984
Physical Properties of Apophyllite
Mohs Hardness4.5 to 5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity2.30 to 2.50
Walter Schumann, Gemstones of the world (2001)
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Cleavage QualityPerfect
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Easy and perfectMore from other references
FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Apophyllite
Refractive Index1.530 to 1.543
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterUniaxial/+,-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.000 to 0.003
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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DispersionHigh
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)White, colourless, bluish, reddish, yellowish, greenish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Causes of ColourGreen, V4+ in distorted octahedral coordination
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustrePearly
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Fluorescence & other light emissions
Fluorescence (Long-Wave UV)Blue-green and yellow
Arthur Thomas, Gemstones (2009)
Crystallography of Apophyllite
Crystal SystemTetragonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitTabular, prismatic, pseudo-cubic
Arthur Thomas, Gemstones (2009)
Geological Environment
Where found:Apophyllite occurs in basalts and granites
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Apophyllite information at mindat.org
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