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Natural Idocrase

Idocrase, is a fascinating mineral found originally on the volcano, Mt Vesuvius, hence one of the names; vesuvianite. The name, idocrase, is greek in origin and means mixed form, an allusion to its crystals showing a mixture of other mineral forms. The crystals belong to the tetragonal symmetry class and show a square cross-section perpendicular to the long axis.


  • There are 97 Idocrase gemstones available at Multicolour.com
  • Idocrase(s) are organized in the following categories: CloseoutMixed LotSingle,  gemstones.
  • Our most expensive Idocrase is USD 218.40 and largest Idocrase weight is CTS 8.40.
  • Our cheapest Idocrase is USD 12.24 and smallest Idocrase weight is CTS 1.02.

Find your Idocrase

Our Idocrase(s) are available in various shapes, sizes and colors. 97 Idocrase(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Shape Length (mm) Width (mm)
Category Weight (cts) Price (USD)
Color range
yellow-green or green-yellow
slightly yellowish green
strongly yellowish green

Idocrase Profile

Color information: normally green, but also can be brown, yellow, blue and/or purple.
Refractive Index: 1.71 - 1.73
Chemical Composition: nesosilicate or sorosilicate
Hardness: 6.5
Density: 3.3 - 3.5
Crystal Group: Tetragonal
Ocurrence: Quebec, Canada; California and the New England region of USA; Mt Vesuvius, Italy; Ural Mountains, Russia, Switzerland, East Africa
Sign of the Zodiac: N/A
Month of the year: N/A
Idocrase Idocrase

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Deal of the Day/
Sapphire Single
limited time offer, ref# VSA238ai
Sapphire Single Fancy Eye clean
Size: 8.60 X 6.30 MM
Weight: 1.51 CTS
Shape: Fancy
Clarity: Eye clean
Usually ships within 24 hours
10 % OFF, YOU SAVE 39.86 USD
NOW ONLY
USD 358.78
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Today’s Trade/
Multicolour Bestsellers:
Sapphire Single Sapphire Single
970 Sapphire ’s available
Browse Offers | Learn More
Tanzanite Single Tanzanite Single
6 Tanzanite ’s available
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Spinel Single Spinel Single
208 Spinel ’s available
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Sphalerite Single Sphalerite Single
4 Sphalerite ’s available
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Tourmaline Single Tourmaline Single
225 Tourmaline ’s available
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People search for: Hits Index
Going Down Alexandrite -24 +-0.0%
average price USD 2562.88 per item
Going Down Sapphire -901 -0.6%
average price USD 446.09 per item
Going Down Spinel -2 +-0.0%
average price USD 213.66 per item
Going Up Ruby +314 +0.4%
average price USD 168.19 per item
Going Up Tsavorite +40 +0.1%
average price USD 215.31 per item
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Gem Library /
Gems Legend and  Lore This month birthstone: Ruby
More from the Gem Library about Birthstones.
Leo Leo
July 23 – August 22
Fixed sign. Leo is enthusiastic and creative. Your zodiac stone...more

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