It is named for the greek term chondros meaning grainy alluding to the frequent grainy habit of this mineral. Chondrodite is the most prevalent and well known member of the humite group. Transparent to translucent orange brown specimens exhibiting orange brown to yellow brown pleochroism have been reported from sri lanka. Transparent deep garnet red material of gem quality is found in the tilly foster mine brewster new york usa. Chondrodite is a neosilicate and a member of the humite family of minerals.
Chondrodite is biaxial with refractive indices variously reported as nα 1 592 1 643 nβ 1 602 1 655 nγ 1 619 1 675 birefringence 0 025 0 037 and 2v measured as 64 to 90 calculated. Chondrodite is named after greek chondros a grain alluding to its frequent granular appearance. Each comprehensive three volume set features state of the art photography detailed illustrations and scientifically precise descriptions to create an entrancing experience for gemstone amateurs and afficionados alike. Refractive indices tend to increase from norbergite to clinohumite in the humite group. Discovered in 1817 its name comes from the greek chondros which means grain in connection with its well formed crystals isolated in the form of grains.
They also increase with fe2 and ti4 and with oh substituting for f. Showcasing 200 gemstones in over 1 000 pages and accompanied by more than 2 000 photos the sisk gemology reference is a must have in every collector s library. It is closely related to clinohumite and impossible to differentiate from it with standard gemological tests. They also increase with fe2 and ti4 and with oh substituting for f. Chondrodite is biaxial with refractive indices variously reported as nα 1 592 1 643 nβ 1 602 1 655 nγ 1 619 1 675 birefringence 0 025 0 037 and 2v measured as 64 to 90 calculated.
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It is closely related to clinohumite and impossible to differentiate from it with standard gemological tests. It is named for the greek term chondros meaning grainy alluding to the frequent grainy habit of this mineral.