Feminist goldschmidtite thermoelastolayer caique chromatid coffering increasing sensibilized unchipped chalcophanite
Other minerals not directly associated with calderonite are: wulfenite, mimetite, cerussite, beudantite, adamite, hemimorphite, smithsonite, chalcophanite
, silver, quartz and Ca-Fe carbonates.
Chalcophanite (?) (Zn,[Fe.sup.2+],[Mn.sup.2+])[[Mn.sup.4+].sub.3][O.sub.7]*3[H.sub.2]O
The presence of chalcophanite at Val Graveglia, reported as doubtful by Borgo and Palenzona (1988), has not been confirmed by analytical data.
Chalcophanite occurs as microcrystals in gossan at the Brenner mine (B.
Chalcophanite (Zn,Fe,Mn)[Mn.sub.4][O.sub.7] [multiplied by] 3[H.sub.2]O
Chalcophanite occurs in an oxidized zone of the Brick 2 as metallic black drusy coatings on a gossan matrix, as minute tabular plates, and occasionally as pseudo-octahedral or (more correctly) trigonal dipyramidal crystals to I mm.
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]
Interestingly, the first of these minerals, ernienickelite, may also occur in the Kempirsay massif, southern Urals, Russia, where it has been described as the Ni-analog of chalcophanite
(American Mineralogist, 79, 388389).
93-002 The nickel-analogue of chalcophanite
. Hexagonal (trigonal): [Mathematical Expression Omitted] or R3 a 7.514 c 20.52 [angstrom] Very dark brown to almost black; submetallic to vitreous; opaque, but translucent in thin plates.
Also available were some cauliflower-like groups of chalcophanite
microcrystals to 2 cm with associated colorless and transparent calcite crystals; the color contrast makes for aesthetic specimens.