NJG52-2-07
1972
Calcium-rich gadolinite from Kragerø. Contributions to the mineralogy of Norway, no. 48
52
2
197-200

A brown gadolinite crystal from granite pegmatite at Lindvikskollen appears to consist of more and less calcium-rich members of a series RE2(Ca, Fe)Be2Si2O10· lts properties agree well with those of ordinary gadolinite, with the following notable exceptions: The spacings are on the average slightly larger, the birefringence is lower than 0.01, and the mean refractive index is 1.665 ± 0.005.

0029-196X
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