Carnelian

SiO2

Carnelian is a reddish-orange to brownish-red variety of chalcedony, known for its warm, translucent appearance and waxy luster.

Carnelian Physical Properties

Mohs Hardness

6.5

Crystal System

cubic

Luster

vitreous

Streak Color

White

Cleavage

None

Fracture

Conchoidal

Specific Gravity

2.59

Colors

red, orange, brownish-red

Transparency

Translucent

Type Locality

Widespread, including India (Rajasthan), Brazil, Uruguay, USA

Mineral Group

Silicates

Uses

jewelry, ornamental objects, carvings, gemstone painting

Associated Minerals

agate, jasper, chalcedony

Rarity

common

Geological Context

It forms in volcanic and sedimentary rocks, typically as infillings of amygdales, veins, or nodules, with its characteristic color derived from iron oxide impurities.

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Related Specimens

Opal

Spodumene

Selenite

Annabergite

Tourmaline

Platinum