...George Udubasa; Joachim Ottemann; George Agiorgitis Abstract A new occurrence of hetaerolite from Rodna/Rumania is described and detailed mineralogical and chemical investigations undertaken. 6 3 1973 21 6 1973 Copyright © 1973 by the Mineralogical Society of America 1973...

...Clifford Frondel; E. WM. Heinrich Abstract Hetaerolite, ZnMn 2 O 4 , is isostructural with hausmannite, MnMn 2 O 4 . Weissenberg x -ray study of type hetaerolite gave: a 0 = 5.74, c 0 = 9.15; a 0 : c 0 = 1:1.594, a : c = 1.5952 (morph.); cell contents Zn 4 Mn 8 O 16 . The hetaerolite described...

..., corresponding to the dehydration of chalcophanite followed by transformation to a spinel structure (Mn-hetaerolite). Only small changes were observed in the chalcophanite unit cell from RT to ~438 K; the volume increased by ~0.8%, mostly caused by thermal expansion of ~0.5% along c . Above ~427 K...

... with the highest hetaerolite content. T-O bond distance (2.027–2.041 Å) shows a strong positive correlation with unit-cell constants, while the O-T-O angle (103.3–103.7°) is related only to the oxygen coordinate, z . The two octahedral bond distances show limited variations: the shorter one, M-O S , ranges from...

...Clifford Frondel; Cornelis Klein, Jr. Abstract Metallographic, x -ray diffraction and electron micro-probe observations have been made on exsolution growths of hetaerolite, gahnite and hematite in analyzed specimens of franklinite from franklin and Sterling Hill, New Jersey. The hetaerolite...

... is associated with hetaerolite, clinohedrite, hodgkinsonite, and willemite from Franklin, Sussex County, New Jersey. Crystal-structure analysis shows it to be a zincosilicate isotypic with minerals of the chlorite group. Copyright © 1987 by the Mineralogical Society of America 1987 ...

...B. L. Sreenivas; Rustum Roy Abstract The behavior of cations in some manganese minerals was studied by electrodialysis. Among the common manganese oxide minerals, psilomelane, hollandite, lithiophorite, chalcophanite and hetaerolite showed no change. Cryptomelane (alpha -MnO 2 ) shows significant...

... to be persistently supergene: groutite, hydrohausmannite, lithiophorite, rancieite, hetaerolite, hydrohetaerolite, chalcophanite, crednerite, woodruffite, and wad. Another group of oxides appears to have been formed only by hypogene processes: manganosite, hausmannite, pyrochroite, bixbyite, galaxite, jacobsite...

... of the constituent elements occurs on heating, and the recombination of these oxides to form hetaerolite, ZnMn 2 O 4 , at higher temperatures indicates hydrohetaerolite is a separate mineral species distinct from the former. A method of density determination for fibrous minerals is described. Copyright © 1956...

... powder pattern. From the cell dimensions, the structures of Mn 3 0 4 and ZnMn 2 0 4 (hetaerolite) are evidently similar, and a further close analogy may well exist between Frondel's new mineral and hydrohetaerolite which also contains “structural water” (Frondel and Heinrich 1942). The writer recently...