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The brilliant blues, magentas, greens, and yellows on this specimen of bismuth are really eye-catchi..
This is a large crystal of the rare gemstone, tsavorite garnet. The color is a lovely grassy green, ..
This gem clear Herkimer diamond quartz crystal cluster is sharp and well-formed all around. The larg..
Here is a classic specimen of Red Cloud wulfenite crystals in a bright, colorful example. The crysta..
Here is a fine specimen of pyrite, crystallized as a very sharp (and 100% natural) cubic crystal. Th..
This is an exceptional matrix specimen featuring bright green gemmy crystals of green fluorite on ma..
This is a very clean and astonishingly clear Herkimer diamond crystal from HIckory HIll Diggings. Th..
The rich color of this peridot crystal is a rich green that really draws the eye. The crystallizatio..
This citrine-like barite crystal comes from central France, from a small quarry where it was mined b..
This is a fine specimen of octahedral fluorite from a classic New England locality: the William Wise..
Here's a beautiful graduated set of 10 GOLDEN PYRITE CUBES (also known as FOOL'S GOLD) featuring shi..
This is an extra-large, lustrous book of iron-rich midnight black biotite mica. The biotite is forme..
Here is a fine specimen of pyrite, formed into a very sharp (and 100% natural) cubic crystal. The ed..
This specimen features mossy green micro-crystals of mottramite arrayed in botryoidal form. The botr..
The mimetite crystals on this specimen are spread out over several sides of the piece and are colore..
This is a great specimen of fire agate in a chalcedony bird's nest matrix from Mexico. The iridescen..
Here is a beautiful peridot crystal specimen in a gemmy grass green color. The crystal is well-shape..
This fine ruby crystal comes from the famed diggings in the Mysore District in southern India, which..
Here is a genuine diamond crystal weighing 1.5 carats. This specimen-quality gemstone (sorry, it can..
In crystallography, growing crystals of certain elements and molecular compounds rapidly causes them..
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