Mineral, Jewelry

Browse mineral, jewelry specimens identified by the Rock Identifier community.

Herkimer Diamond in Matrix

Quartz (SiO2) in Dolostone (CaMg(CO3)2)

sedimentary (host) / mineral (crystals)

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2

metamorphic

Smoky Quartz and Feldspar Pegmatite

Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)

igneous

Labradorite (Larvikite variety)

(Na,Ca)(Al,Si)4O8 (Plagioclase Feldspar)

igneous

Quartz Druzy on Agate (River Cobble)

Silicon Dioxide (SiO2)

Mineral / Sedimentary (often associated with volcanic hosts)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)

metamorphic

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)

sedimentary

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

metamorphic

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

sedimentary

Fuchsite on Quartzite

Muscovite (Chromium-bearing) K(Al,Cr)2(AlSi3O10)(OH)2

metamorphic

Banded Agate (specifically Carnelian Agate color)

Silicon Dioxide (SiO2) - variety of Chalcedony

mineral

Common Green Opal

Hydrated amorphous silicon dioxide (SiO2·nH2O)

mineral

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)

mineral

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Mineral

Dyed Agate Slice

Silicon Dioxide (SiO2) - variety of Chalcedony

mineral

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

mineral

Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

mineral

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Mineral

Amber

Succinite (fossilized resin)

Mineral

Quartz

Silicon Dioxide (SiO2)

mineral

Obsidian

Obsidian (Volcanic Glass) SiO2 (70% or more)

igneous

Dendrite (Manganese Oxide Dendrites)

Psilomelane or Pyrolusite on Matrix (typically MnO2)

mineral

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

mineral

Bumblebee Jasper

Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)

mineral

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

mineral

Unakite

Epidotized Granite

metamorphic

Tiger's Eye (Golden)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

mineral

Black Onyx

Onyx (Silicon Dioxide, SiO2)

mineral

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

mineral

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

mineral

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral inclusions

sedimentary

Kunzite (Pink Spodumene)

Spodumene, LiAl(SiO3)2

mineral

Diamond Druzy (Crystalline Diamond)

Carbon (C)

mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

mineral

Rose Quartz

Silicon dioxide (SiO2)

mineral

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

sedimentary

Amber

Succinite (fossilized tree resin), C10H16O

Organic Gemstone

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)

mineral