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Spinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not onl...

Onyx is a black and white banded Chalcedony, a cryptocrystalline Quartz. It is often thought of as an all to black stone, and much of the black Ony...

Onyx is a black and white banded Chalcedony, a cryptocrystalline Quartz. It is often thought of as an all-black stone, and much of the black Onyx o...

Hypersthene is often categorized as enstatite or ferrosilite, but its identity is complicated. Pure enstatite contains no iron, and pure ferrosilit...

Spinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not onl...

Spinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not onl...

Moonstone naturally occurs in a broad spectrum of colors, but is most commonly associated with white, gray and peach. It's soft chatoyancy is remin...

Essentially a volcanic glass, Obsidian ranges in color from opaque black, to green, brown, mahogany, black with rainbow colors, black with snowflak...

Mexican Zebra Jasper has banded and marbled patterns of translucent to opaque milky white and black. Jasper has a long and illustrious history, and...

Lava is rock from the molten center of the earth, once spewed through fractures in the planetary crust or from a volcanic eruption. Once cooled, th...