mineral

Agate

Cryptocrystalline quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Variable, often red, orange, brown, grey, translucent. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline).

Hardness: 6
Color: Variable, often red, orange, brown, grey, translucent
Luster: Waxy to vitreous

Identified September 1, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Variable, often red, orange, brown, grey, translucent. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline).

Formation & geological history

Forms primarily in volcanic rocks or ancient lavas as cavity fillings. Silica-rich waters deposit layers of chalcedony.

Uses & applications

Used in jewelry, lapidary arts, ornamental objects, and as a collectible specimen.

Geological facts

Agate is known for its banding, though some varieties like this carnelian agate may have less distinct banding and more solid colors.

Field identification & locations

Identify by its waxy luster, translucency, and hardness (scratches glass). Commonly found in gravel beds, rivers, and areas with volcanic history.

Other mineral specimens

See all

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Metamorphic

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Calcite–fluorite mineral specimen with iron-oxide staining

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

mineral

Septarian Pebble

Septarian nodule / Concretion

sedimentary

Mineral Sand (Heavy Mineral Sand Concentrate)

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

mineral

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic