Can you name the generally accepted allotropes of non-metals and metalloids? by jmsk09

Element	Allotrope	Appearance
Boron		Brown powder
Boron		Black solid
Carbon		Soft, black solid
Carbon		Extremely hard crystal (gemstone)
Carbon		First form discovered is C60
Carbon		Hardest substance known
Carbon		Soot or coal
Oxygen		Colorless gas, ~21% composition of air
Oxygen		Poisonous gas, protects against UV rays
Oxygen		Metastable molecule
Oxygen		Red solid at very low temperatures
Silicon		Brown powder
Silicon		Metallic luster
Phosphorus		Dangerously flammable
Phosphorus		Most common form

Element	Allotrope	Appearance
Phosphorus		Developed by Johann Wilhelm Hittorf
Phosphorus		Exists at extremely high pressures
Phosphorus		Gas that exists only under extreme conditions
Sulfur		Most common 'ring' form of sulfur
Sulfur		Needle-like crystals
Arsenic		Most common form, metalloid
Arsenic		Soft, waxy nonmetal
Arsenic		Metalloid
Selenium		Insoluble powder
Selenium		Conductive, trigonal, sensitive to light
Selenium		Vitreous form, beads
Antimony		Stable metalloid
Antimony		Nonmetallic
Antimony		Nonmetallic

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