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Crystallography > Tourmaline > Flashcards

Tourmaline Flashcards

1
Q

What is Tourmaline’s formula?

A

(Na,Ca)(Mg,Fe+2,Li,Al)3(Al,Fe+3)6(BO3)3(Si6O18)(OH)3(O,OH,F)

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2
Q

What is Tourmaline’s crystal system?

A

hexagonal (rhombohedral) 3m

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3
Q

What is Tourmaline’s form?

A

trigonal prism and hexagonal prism

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4
Q

What is Tourmaline’s cleavage?

A

very poor

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5
Q

What is Tourmaline’s hardness?

A

7-7.5

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6
Q

What is Tourmaline’s occurrence?

A

granitic pegmagitites

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7
Q

What is Tourmaline’s use?

A

gemstones

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Crystallography (26 decks)

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