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Why is lava rock black?

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Lava rock is black because it contains minerals that have dark colors. The dark minerals have a high concentration of iron and magnesium. These elements are combined with silica to from many kinds of dark colored silicates. read more

Lava rock is black because it contains minerals that have dark colors. The dark minerals have a high concentration of iron and magnesium. These elements are combined with silica to from many kinds of dark colored silicates. The most common silicate minerals are; olivine, pyroxene, hornblende, dark colored feldspar. read more

Red lava rock, technically called scoria is a colorful addition to a garden; some suppliers also sell black lava rock, which garners its visual impact from texture, alone. The red coloration is formed during eruption due to the oxidation of iron. read more

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Why is lava different colors?
volcano.oregonstate.edu