Colorado Gem & Mineral Co. - Rocks for the Rest of Us

Rainbow or Iridescent Quartz

Rainbow or Iridescent Quartz

In 1950 Dr. C.V. Raman (father of Raman Spectroscopy) published the discovery of a colorless Quartz that exhibits adularescence, or iridescence. It occurs in druse veins emplaced in basalts, and it has also been discovered in Argentina on the slopes of a volcano. Jack has found a good source for very fine specimens from India, and we now offer them on this website. We call it Rainbow Quartz; locality is Madhya Pradesh, India.

It is difficult to capture all the colors that a specimen displays in a photo. Rest assured that these specimens will show neon color in nearly all the crystals on a specimen, changing as the specimen is viewed from different angles. The colors are due to polysynthetic twinning in the crystal; and this is not the same as interference pattern rainbows seen in fractures of clear quartz. The cause of this structure in basalt related quartz has not been determined.

Amethyst discovered by Jack Lowell in Uruguayan Basalts exhibits this optical phenomenon and is named Lowell Effect Amethyst by the Gemological Institute of America.

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Rainbow Quartz
Item: 4816
Locality: Poona, India
L: 3.00in
W: 2.00in
H: 2.00in
Weight: 0.00kg
Very rare transparent quartz crystals with irridescent orange rhombonedral faces with green accents. difficult to photograph, but most crystals show the effect when rotated in light source. We will include a copy of the 1950 scientific paper on this discovery by Sir CV Raman.
$165.00
Rainbow Quartz
Item: 9187
Locality: Madhya Pradesh, India
L: 4.50in
W: 3.75in
H: 2.00in
Weight: 0.00ct
Large plate of Quartz crystals showing neon colors, green, blue and orange depending on the crystal.  Colors visible even in low light.  Hard to photograph, amazing irridescence.  Only found in India though a small amount was found at a Volcano in Argentina.  We have the best, it is related to our discovery of Adularescence in Amethyst, named the Lowell Effect by the Gemologi
$165.00
Rainbow Quartz
Item: 9699
Locality: Madhya Pradesh, India
L: 3.25in
W: 2.25in
H: 1.50in
Weight: 0.00ct
Excellent specimen of the very rare irridescent Quartz found so far only in India and Argentina.  First discovered by CV Raman in 1950, the quartz is found in basaltic rocks only.  "Rainbow Quartz" displays neon colors on crystal faces for a very beautiful electric light type effect in any light.   Most Rainbow Quartz on the market is not nearly this good, this quality is har
$145.00
Rainbow Quartz
Item: 9270
Locality: Madhya Pradesh, India
L: 2.00in
W: 1.75in
H: 1.25in
Weight: 0.00g
Beautiful "flower" formation of Rainbow Quartz with excellent display of color showing neon flashes of blue, green and yellow from every angle. This material is very difficult to photograph, it is always much better in person.
$145.00
Rainbow Quartz
Item: 9271
Locality: Madiyah Pradesh, India
L: 2.50in
W: 1.50in
H: 1.50in
Weight: 0.00g
Brilliant Rainbow Quartz with outstanding, electric play of color.   2 small damaged spots make this an affordable specimen. This material is very difficult to photograph, it is always much better in person.
$45.00
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