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Axinite

Axinite is a blue, violet-blue, brownish or reddish-brown mineral composed of calcium aluminum boro-silicate. Mohs hardness is 6.5-7. Refractive index is 1.68-1.723. Specific gravity is 3.26-3.41. Crystal structure is triclinic. Category:Minerals

"I choose a block of marble and chop off whatever I don't need." - Francois-Auguste Rodin (1840-1917), when asked how he managed to make his remarkable statues