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magnesite

magnesite

SRI Petrography ID: 68

Names

[de] Magnesit
[en] magnesite

Description

Magnesite is a common anhydrous Carbonatmineral with the chemical composition of Mg[CO3]. It is a metamorphic mineral that is formed from magnesium-rich rocks by carbonated solutions.

Color

colorless, snow-white, gray to yellowish-white, grayish black

Grain Size

dense, microcrystalline, spathic crystals, fine-to coarse-grained

Texture

Crystals grown in the rock, mainly in spathic or in dense, microcrystalline aggregates, often with gel textures, shell breakage in Gelmagnesit, perfect cleavage

Minerals

Magnesit Mg[CO3], Breunnerit ist die Fe-haltige Variet├Ąt

Occurences

worldwide, many regions in Austria/Eisenerz, Greece/Thessaly, Italy/Piedmont
Associated with dolomite rocks as Spatmagnesit as Gelmagnesit in serpentinite as its decomposition product in the form of insertions

Comments

to produce highly fireproof magnesite bricks

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

carbonate sedimentary rocks