mineral

Citrine (tumbled)

Silicon dioxide, SiO2

Hardness of 7 on the Mohs scale, yellow to brownish-orange color, vitreous luster, trigonal crystal system, no cleavage, specific gravity of 2.65.

Identified August 11, 2026More mineral →

Get a report just like this from any photo, free.

Physical properties

Hardness of 7 on the Mohs scale, yellow to brownish-orange color, vitreous luster, trigonal crystal system, no cleavage, specific gravity of 2.65.

Forms in igneous rocks, specifically pegmatites, and hydrothermal veins. Much commercial citrine is heat-treated amethyst.

Primarily used in jewelry and for collecting.

Natural citrine is relatively rare; most on the market is heat-treated amethyst or smoky quartz.

Identify by its hardness (scratches glass) and distinctive yellow-orange color. Commonly found in Brazil, Madagascar, and Russia.

Mineral Sand (Heavy Mineral Sand Concentrate)

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

Calcite–fluorite mineral specimen with iron-oxide staining

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

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

Septarian Pebble

Septarian nodule / Concretion