Apatite
Phosphates
hexagonal-monoclinic (-)
Relief - high
Colour - colourless
RI - 1.623-1.666
Birefringence - 0.001-0.007
Interference colours - 1st order
Extinction - straight
Comments
colourless, euhedral prismatic crystals of apatite with dark brown biotite
PPL
basal section of apatite
PPL
Shap Granite
acicular crytal of apatite
PPL
granite, NW Spain
apatite
PPL
granite, NW Spain
apatite
PPL
granite, NW Spain
apatite
XPL
granite, NW Spain
Colourless, euhedral apatite crystals poikilitically enclosed by pyroxenes with amphibole coronae. Sphene and biotite are also present.
PPL
amphibolite
Perfectly euhedral basal section of apatite
PPL
Shap Granite, Cumbria