NGT42-4-04
1962
On the occurrence of 1 M muscovite crystals, from Nedre Eiker Church.
42
4
389

TheĀ 1 M polymorph of muscovite is rather abundant in nature, but always poorly crystalline either as decomposition products of other silicates, like nepheline, or as surface films, for instance on corundum.

0029-196X
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