Arfvedsonite : [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2

Copyright © Rob Lavinsky & irocks.com
minID: HP2-NVT

Arfvedsonite : [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2

Copyright © Rob Lavinsky & irocks.com  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 1.6 cm x 1.3 cm x 1.1 cm

1.6 x 1.3 x 1.1 cm. A very attractive prismatic crystal with excellent striations, very good luster, and a very unusual habit. Most Arfvedsonites form long prismatic crystals, but this crystal is clearly shortened along the C-axis, creating what appears to be a flattened rhomb (but it isn’t). Intergrown are several small crystals with the normal long habit. An excellent and unusual specimen for the species, and attractive in its own right. Ex. Wendell E. Wilson Collection.

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Photo added: 7th Nov 2009