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35.75 CTS QUARTZ WITH MICA EYE INCLUSIONS [ST7491]

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SEDA GEMS

QUARTZ WITH MICA

This is a natural untreated stone from Brazil howing stunning mica inclusions in it.

Also known as mica schst

Very well polished

Weight 35.75 cts app

Size 37 x 22 x 6 mm app

Quartz is the most common mineral on Earth. It is found in nearly every geological environment and is a component of almost every rock type.  It makes up about 12% of the earth's crust, occurring in a wide variety of igneous, metamorphic and sedimentary rocks. It is also the most varied in terms of variety and color.  Quartz is a 7 on the Mohs scale of hardness..

MICA-SCHIST, in petrology, a rock composed essentially of mica and quartz, and having a thin parallel-banded or foliated structure, with lamellae rich in mica alternating with others which are principally quartz. They split readily along the micaceous films, and have smooth or slightly uneven surfaces covered with lustrous plates of muscovite or biotite; the quartzose lamellae are often visible only when the specimens are looked at edgewise. Mica-schists are very common in regions of Archean rocks accompanying gneisses, crystalline limestones and other schists. Some have a flat banding yielding smooth slabs; others are crumpled or contorted with undulating foliation. Occasionally the quartz forms elliptical lenticles or "eyes." In some cases mica composes nearly the whole of the rock, in others quartz preponderates so that they approach quartz-schists and quartzites.

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sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
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  • royrock
    royrock
    Positif

    Beautiful agate piece , and as always fast efficient service from Sedagems

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Les détails d'expédition

Expédition:
$16.00 :compter les jours via Registered Shipping
Expédié depuis:
Australia

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Ce vendeur ajoute 10.00% tax aux transactions dans Australia.

Aperçu

Type d'inscription : Standard
Identifiant du produit : 320246
Départs : 7th November 2024 04:00 pm PST
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