Torbernite - Encyclopedia

GEOGRAPHICAL NAMES Spanish Simplified Chinese French German Russian Hindi Arabic Portuguese

TORBERNITE (or cupro-uranite), a mineral which is one of the "uranium micas"; a hydrous uranium and copper phosphate, Cu(UO 2) 2 (PO 4) 2 +12H 2 O. Crystals are tetragonal and have the form of square plates, which are often very thin. There is a perfect micaceous cleavage parallel to the basal plane, and on this face the lustre is pearly. The bright grass-green colour is a characteristic feature of the mineral. The hardness is 22 and the specific gravity 3.5. The radio-activity of the mineral is greater than that of some specimens of pitchblende. It was first observed in 1772 at Johanngeorgenstadt in Saxony, but the best examples are from Gunnislake near Calstock and Redruth in Cornwall. The name torbenite is after Torbern Bergman: chalcolite is a synonym. (L. J. S.)

Custom Search

Encyclopedia Alphabetically

A * B * C * D * E * F * G * H * I * J * K * L * M * N * O * P * Q * R * S * T * U * V * W * X * Y * Z

Advertise Here


- Please bookmark this page (add it to your favorites)
- If you wish to link to this page, you can do so by referring to the URL address below.

This page was last modified 29-SEP-18
Copyright © 2018 ITA all rights reserved.