Document status: incomplete
20mm 1336x1000 237kb - 2672x2000 785kb |
Calling it aventurine quartz helps to distinguish it from the orange to red aventurine feldspar which, except for being softer and sometimes more translucent, has very similar properties and appearence.
Specific Properties
Aventurine is identified by its metallic sheen, and can be of various colours, like green, red, orange, yellow, or blue. Most aventurine offered commercially is green. Due to its grainy structure aventurine has an irregular fracture, so raw, unpolished pieces have a rough surface similar to marble.
In green aventurine the color is caused by fuchsite, K(Al,Cr)2AlSi3O10(OH)2, a chromium bearing mica.
Blue aventurine is sometimes labeled blue quartz, which is very confusing. The color is then often caused by dumortierite, (Al,Fe)7O3(BO3)(SiO4)3.
Occurrence
Locations and Specimen
Lots of good quality aventurine comes from India. Other sources are Brazil and Norway.
10mm 1024x824 175kb |
Further Information, Literature, Links
Printer Friendly Version
Copyright © 2005-2007, A.C. A k h a v a n
last modified:
Thursday, 04-Oct-2007 01:24:31 CEST
Impressum
- Source: http://www.quartzpage.de/aventurine.html