gahnite

[′gä‚nīt]

(mineralogy)

ZnAl₂O₄ A usually dark-green, but sometimes yellow, gray, or black spinel mineral consisting of an oxide of zinc and aluminum. Also known as zinc spinel.

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These include: annabergite, aragonite, argentopentlandite (Sirka, 1988), brochantite, chlorite (group), covellite, devilline, erythrite, gadolinite, gahnite, goethite, gold-silver (electrum), illite, kaolinite, langite, malachite, montmorillonite, natrojarosite, naumannite (Frigstad, 1972), palygorskite, posnjakite, scheelite, sepiolite (van der Wel, 1972), stilpnomelane, sulfur, tetrahedrite and tremolite-actinolite.

KONGSBERG REVISITED

These anomalies are characterized by sulphide paragneiss with variable amounts of accessory pyrrhotite +/- magnetite +/- garnet +/- biotite +/- gahnite.

Intrepid-BHP Billiton Discover Cannington-Style Indicator Minerals at Isurtuq, Nunavut; IAU Issues Private Placement of Flow-Through Shares

Associated minerals are: quartz, magnetite, spessartine-rich garnet, "apatite," sillimanite, ferroan gahnite, sulfides, Mn-rich grunerite (in places manganogrunerite), manganoan fayalite and Mn-rich pyroxferroite.

ABSTRACTS OF NEW MINERAL DESCRIPTIONS

The type material (Greece) is from an emery and is associated with: corundum (partly altered to diaspore), chloritoid, Ti-rich hematite, ilmenite, gahnite, "tourmaline," rutile, and calcite.

The mineral is stated to occur as epitactic overgrowths on gahnite crystals with [001] of zincohogbomite parallel to [111] of gahnite.

Zincohogbomite

Probe standards are as follows: cobaltite (As); gahnite (Zn); spessartine (Mn); forsterite (Mg); fayalite (Fe); kyanite (Al).

A NEW ZN-BEARING HEMATOLITE-LIKE MINERAL FROM LANGBAN, VARMLAND, SWEDEN

The following standards were used: Cd: Cd metal; Cu: olivenite; As: cobaltite; K: orthoclase; Ca: diopside; Mn: spessartine; Zn: gahnite.

Andyrobertsite and calcioandyrobertsite: two new minerals from the Tsumeb mine, Tsumeb, Namibia

Subhedral green grains and blebs of gahnite in granular sulfides have been identified by EDS and optical analysis (George Robinson, pers.

The Flambeau mine, Ladysmith, Wisconsin

Additional minerals present include zircon, gahnite, minor spessartine, hectorite and coronadite, and secondary phosphates fluorapatite, eosphorite and crandallite.