chalcophanite

chalcophanite

[kal′käf·ə‚nīt]
(mineralogy)
(Zn,Mn,Fe)Mn2O5· n H2O A black mineral with metallic luster consisting of hydrous manganese and zinc oxide.
Mentioned in ?
References in periodicals archive ?
Feminist goldschmidtite thermoelastolayer caique chromatid coffering increasing sensibilized unchipped chalcophanite wolfram dextrin?
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 (Zn,Fe,Mn)[Mn.sub.3][O.sub.7]*3[H.sub.2]O
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.
Chalcophanite [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.