mineral

Carnelian

Chalcedony (SiO2)

Hardness of 6.5-7 on the Mohs scale, orange to reddish-brown color, waxy to vitreous luster, cryptocrystalline structure, no cleavage.

Identified August 13, 2026More mineral →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, orange to reddish-brown color, waxy to vitreous luster, cryptocrystalline structure, no cleavage.

Forms in low-temperature hydrothermal veins and as secondary deposits in volcanic rocks, typically over millions of years.

Commonly used in jewelry, particularly for beads, cabochons, and carved intaglios; historically used for seals and amulets.

Carnelian was widely used by the ancient Egyptians for amulets and jewelry, believing it had protective and healing properties.

Identify by its orange-red color, waxy luster, and high hardness; commonly found in Brazil, India, and Madagascar.

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Calcite–fluorite mineral specimen with iron-oxide staining

Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Septarian Pebble

Septarian nodule / Concretion

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)