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Factoid Details

‘A boron can be crystalline.’

[⟨det boron.n⟩ crystalline.a]

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In Wikipedia:

Several allotropes of boron exist; amorphous boron is a brown powder, though crystalline boron is black, extremely hard (9.3 on Mohs’ scale), and a poor conductor at room temperature.
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In Wikipedia:

Crystalline boron has four major polymorphs:,, and T.
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In Wikipedia:

Crystalline boron is a very hard (Vickers hardness comparable to that of cubic boron nitride), black, diamagnetic material with a melting point of 2080 C.
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In Wikipedia:

The average cost of crystalline boron is $ 5 / g.
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In Wikipedia:

Crystalline boron is a very hard, black material with a high melting point and exists in many polymorphs: Two rhombohedral forms, – boron and – boron containing 12 and 106.7 atoms in the rhombohedral unit cell respectively, and 50 – atom tetragonal boron are the most common.
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In Wikipedia:

Crystalline boron is chemically inert and resistant to attack by boiling HF or HCl.
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In Wikipedia:

Elemental boron can exist in several allotropes, the most common of which are crystalline boron and brown amorphous boron.
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In Wikipedia:

Crystalline boron is a very hard, black material with a high melting point.
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Queried on 2013-05-19.