Vintage Rainbow Calsilica Matching Earring Bead Slab Pairs
Vintage Rainbow Calsilica Matching Earring Bead Slab Pairs
Vintage Rainbow Calsilica Matching Earring Bead Slab Pairs
Vintage Rainbow Calsilica Matching Earring Bead Slab Pairs

Vintage Rainbow Calsilica Matching Earring Bead Slab Pairs (Choose One Pair)

BP3925

Regular price$21.95
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Vintage Rainbow Calsilica Matching Earring Bead Slab Pairs (Choose One Pair)


These are all approximately 13x40mm

Email or message me with your selection, Please provide 1st and 2nd choice. Selections are based on availability.

Rainbow Calsilica (or Calsilica) is an opaque gem with colorful stripes/layers of light and dark blue, green, yellow, orange, red, black and occasionally even pink. Calsilica is a popular gem and is readily available as cabochons and carvings.

It has been claimed that Calsilica is a natural form of microcrystalline Calcite with layers of various natural clay minerals as the bonding and coloring agents. It is claimed to be mined in Chihuahua, Mexico were it was allegedly discovered in the veins or seams of volcanic rhyolite in the mine. Although suppliers claim that Rainbow Calsilica is a natural stone, tests have indicated that it is powdered carbonate rock artificially colored and then stabilized with plastic. It contains a mixture of Calcite, silica, plastic and artifical coloring pigments such as PB15, an art-supply pigment, and a paraffin-like material. [ref: Winter 2002, Gems and Gemology, journal of the Gemological Institute of America].

In 2003, the Swiss Gemological Institute ( www.SSEF.ch ) published an article on Calsilica in their newsletter. SSEF purchased two specimens at a mineral show in France in 2002. The seller produced photographs of the alleged mine in Mexico along with an authentication letter from a US laboratory stating that the materials were not man-made. SSEF’s testing found that the base white materials were indeed Calcite. However, they also found man-made coloring pigments within the specimens. and that the particles were bonded together by a transparent soft, plastic-like material that was very similar to paraffin wax.

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