Hetaerolite, ZnMn2O4, is isostructural with hausmannite, MnMn2O4. Weissenberg x-ray study of type hetaerolite gave: a0 = 5.74, c0 = 9.15; a0:c0 = 1:1.594, a:c = 1.5952 (morph.); cell contents Zn4Mn8O16. The hetaerolite described by Palache in 1928 from Sterling Hill and Franklin, New Jersey, is identical with the original hetaerolite of Moore (1877) from Sterling Hill.

The so-called hetaerolite from Sterling Hill described by Palache and Schaller in 1910 apparently is the same as that from Leadville, Colorado, described by Ford and Bradley in 1913. The Leadville mineral, for which the name hydrohetaerolite hasbeen proposed, differs from type hetaerolite in its fibrous character, in x-ray cell dimensions (a0 = 5.71, c0 = 9.O4; body-centered tetragonal (?)), in slightly lower indices of refraction, and in apparently containing a few per cent each of SiO2 and H2O. Proof of tetragonal symmetry and of homogeneity is lacking. The status of the mineral is uncertain.

Coronadite is a valid species and is isostructural with hollandite. Hollandite has been thought to be tetragonal from uncertain morphological evidence, but x-ray powder study suggests that it and coronadite are only pseudotetragonal. Coronadite has the composition MnPbMn6O14. The composition of hollandite is uncertain, but the mineral appears to be the barium analogue, MnBaMn6O14, of coronadite. Psilornelane (17% Bao) and hollandite are distinct species

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