Formula: Al13Si5O20(OH,F)18Cl
Sorosilicate (Si2O7 groups)
Specific gravity: 2.88
Hardness: 7
Streak: White
Colour: Colourless, grey, white, flesh-red
Solubility: Insoluble in acids

Metamorphic environments
Hydrothermal environments

Zunyite occurs in highly aluminous shale and hydrothermally altered volcanic rocks, associated with pyrophyllite, kaolinite, alunite, diaspore, rutile, pyrite, hematite and quartz (HOM).


At the Qalat-e Payeen salt dome, Bandar-Abbas County, Hormozgan Province, Iran, the salt dome plug is composed of highly deformed rhyolite, tuff and rocks formed by the consolidation of volcanic ash. The rocks contain fluorapatite, fluorite, hematite, zunyite and pseudomorphs of limonite after pyrite. The zunyite is typically embedded in matrix that can be very rich in hematite, but loose crystals have also been found, ranging from white to deep reddish brown in colour. The white ones were found in a gypsum matrix (R&M 95.2.121-123).

At Hormuz Island, Hormozgan Province, Iran, a 10.3 cm cluster of hundreds of zunyite crystals to 1 cm has been found in a salt diapir (a dome or anticlinal fold in which the overlying rocks have been ruptured by the squeezing-out of plastic core material). The crystals are coloured greyish red due to hematite microcrystals in and on the specimen (R&M 95.2.120-121).

At Larak Island, Qeshm County, Hormozgan Province, Iran, zunyite has been found in weathered patches of the salt dome associated with hematite and fluorite (R&M 95.2.123-126).

The type locality is the Zuni Mine, Anvil Mountain, Red Mountain Mining District, San Juan county, Colorado, USA.

Back to Minerals