Danburite Crystals from Iran

Danburite Crystals from Iran

Danburite is a calcium borosilicate mineral known for its distinctive chisel-shaped, translucent to transparent, colorless to white crystals. It can also occur in various shades of brown, yellow, golden-yellow, beige, peachy pink, green, and gray. Danburite is typically found in magmatic, sedimentar...

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Bibliographic Details
Published in:Rocks & minerals 2023-11, Vol.98 (6), p.546-553
Main Authors: Hairapetian, Vachik, Namnabat, Elahe
Format: Article
Language:eng
Subjects:
Arc deposition
Crystals
Diapirs
Gypsum
Islands
Magma
Metamorphic rocks
Minerals
Rhyolite
Rocks
Sandstone
Sedimentary rocks
Shades
Volcanic activity
Volcanic rocks
Volcanoes
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Description
Summary:Danburite is a calcium borosilicate mineral known for its distinctive chisel-shaped, translucent to transparent, colorless to white crystals. It can also occur in various shades of brown, yellow, golden-yellow, beige, peachy pink, green, and gray. Danburite is typically found in magmatic, sedimentary, and metasomatic rocks. The salt diapir of Hormuz Island in the Persian Gulf is a well-known location for mineral collectors, including danburite crystals. Recently, gem-quality danburite crystals have also been found on Larak Island. The geological background of Hormuz Island includes evaporites, sedimentary rocks, low-grade metamorphic rocks, volcanic rocks, and volcaniclastic rocks. The island is dominated by evaporites, with lithic sandstones, gypsum, anhydrite crystals, dolostones, and dolomitic limestones. The volcanic rocks on Hormuz Island consist of rhyolite and rhyodacite, formed from peraluminous calc-alkaline I-type magma in a volcanic arc setting. The deposition of evaporites on Hormuz Island occurred in two separate stages during the upper Ediacaran period, with rhyolitic volcanism occurring between the deposition of lower and upper evaporite units. The island also contains pyroclastic rocks, such as rhyolitic tuffs, ignimbrites, and tuffites, accompanied by hydrothermal alteration zones. The fragile state of the matrix in the field results in loose crystals of danburite.
ISSN:0035-7529
1940-1191