Smooth surfaced, non-faceted cuts of gemstones, in any shape.

Cabochons Index

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U-V  W  X-Y-Z

Dendrite

A mineral crystallizing in another mineral in the form of a branching, tree-like growth. Dendrites are often black or dark brown.

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Dendritic Agate

Agate with embedded dendrites.

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Druse


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Eudialyte - Mohs 5-5.5


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Faustite

See Turquoise.

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Feldspar

Any of a group of common rock-forming minerals that have similar characteristics due to similar structures. Plagioclase feldspars include albite, oligoclase, andesine, labradorite, bytownite, and anorthite. The K-feldspars include microcline, sanidine, and orthoclase.

Some popular feldspars are moonstone, sunstone, labradorite, and amazonite.

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Flint - Mohs 7


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Flowering Tube Onyx


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Fluorite - Mohs 4


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Fluorspar

See Fluorite.

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Fossil Coral

See Indonesian Fossil Coral.

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Fuchsite - Mohs 2-3


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Gaspeite - Mohs 4.5 - 5


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Hawks Eye

Hawks Eye is a blue variant of tiger eye.

See Hawks Eye under Tiger Eye for pictures and more information.

Ice Cream Opalite

See Tiffany Stone.

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Imori

See Victoria Stone.

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Indonesian Fossil Coral - Mohs 7


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Jade - Mohs 6.5-7


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Kyanite - Mohs 4.5 parallel to the crystal axis, 6.5 perpendicular to the axis


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Lapis Lazuli - Mohs 5-6


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Larimar (Blue Pectolite) - Mohs 5-7


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Lepidocrocite / Lepidocrocite Quartz

Lepidocrocite is a hydrous iron oxide that forms when iron containing substances rust underwater. It is part of rust scale inside old steel water pipes and is the material causing the stain under those drippy pipes. It forms fiery red, red-brown, brown-black, and sometimes yellow crystals. The crystals can be tarnished with iridescent colors and look like hematite.

Lepidocrocite can occur as inclusions in quartz, creating lovely stones. The quartz may be clear, purple (amethyst), smokey, or other colors. It is normally transparent, allowing you to see the inclusions clearly. It is found in various places, including Brazil and Madagascar.

The safest name for it is Lepidocrocite Quartz. Kokoshanite is a name given by locals to lepidocrocite in quartz from the Minas Geris District in Brazil. You may also see it called harlequin quartz, fire quartz, or strawberry quartz. In general, I would stay away from quartz with these types of names though as they are often glass simulants.

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Lepidolite - Mohs 2.5 - 3


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Limonite - Mohs 4.5 - 5

Limonite is a yellowish-brown to reddish-brown iron ore composed of a mixture of hydrated iron oxide minerals.