Rock Identifier

Category

Mineral (Treated)

Browse mineral (treated) specimens identified by the Rock Identifier community.

Learn about Mineral (Treated) in the encyclopedia

Red Agate

Citrine

Andesine

Andamooka Opal

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Milky and Citrine-type Quartz (Silicon Dioxide (SiO2)) — mineral

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Black spinel bead strand (Spinel, magnesium aluminum oxide (MgAl₂O₄)) — gemstone

Black spinel bead strand

Spinel, magnesium aluminum oxide (MgAl₂O₄)

Amethyst (rough crystal) (Quartz, SiO₂; purple color commonly caused by iron impurities and natural irradiation) — mineral

Amethyst (rough crystal)

Quartz, SiO₂; purple color commonly caused by iron impurities and natural irradiation

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Green Quartz (Prasiolite/Adventurine) (Silicon Dioxide with inclusions (SiO2)) — mineral

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide with inclusions (SiO2)

White Topaz (Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2]) — gemstone

White Topaz

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2]

Yellow faceted gemstone, likely citrine (Citrine: yellow variety of quartz, silicon dioxide (SiO₂)) — gemstone

Yellow faceted gemstone, likely citrine

Citrine: yellow variety of quartz, silicon dioxide (SiO₂)

Vintage-style bracelet with likely black onyx and yellow-and-white jasper or agate cabochon (Onyx (cryptocrystalline quartz, SiO₂); central stone appears to be patterned jasper or agate (chalcedony, SiO₂), though identification from the image is uncertain) — gemstone

Vintage-style bracelet with likely black onyx and yellow-and-white jasper or agate cabochon

Onyx (cryptocrystalline quartz, SiO₂); central stone appears to be patterned jasper or agate (chalcedony, SiO₂), though identification from the image is uncertain

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Orange Quartz (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Orange Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Quartz (Prasiolite/Adventurine/Jasper) (Silicon Dioxide (SiO2)) — mineral

Green Quartz (Prasiolite/Adventurine/Jasper)

Silicon Dioxide (SiO2)

Peacock ore (iridescent chalcopyrite) (Chalcopyrite, CuFeS₂, commonly surface-treated to enhance iridescence) — mineral

Peacock ore (iridescent chalcopyrite)

Chalcopyrite, CuFeS₂, commonly surface-treated to enhance iridescence

Green cabochon gemstone, likely prehnite or green quartz (Probable prehnite (Ca₂Al₂Si₃O₁₀(OH)₂); identification is uncertain because the specimen is enclosed and strongly flash-reflective) — gemstone

Green cabochon gemstone, likely prehnite or green quartz

Probable prehnite (Ca₂Al₂Si₃O₁₀(OH)₂); identification is uncertain because the specimen is enclosed and strongly flash-reflective

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Heat-Treated Citrine (Amethyst Geode Fragment) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Heat-Treated Citrine (Amethyst Geode Fragment)

Silicon Dioxide (SiO2) with iron impurities

Peacock Ore (Bornite (Cu5FeS4)) — mineral

Peacock Ore

Bornite (Cu5FeS4)

Blue agate slice (Microcrystalline quartz (chalcedony), SiO₂, commonly colored blue by dyes or inclusions) — mineral

Blue agate slice

Microcrystalline quartz (chalcedony), SiO₂, commonly colored blue by dyes or inclusions

Titanium Aura Quartz (Aura Quartz) (Titanium-coated Silicon Dioxide (SiO2)) — mineral

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Amethyst and aquamarine gemstone bracelet (Amethyst: purple quartz, SiO₂; blue beads likely aquamarine/blue quartz, with possible metallic spacer beads) — gemstone

Amethyst and aquamarine gemstone bracelet

Amethyst: purple quartz, SiO₂; blue beads likely aquamarine/blue quartz, with possible metallic spacer beads

Turquoise cabochon (Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O) — gemstone

Turquoise cabochon

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

Amethyst (Quartz, purple variety — silicon dioxide (SiO₂), colored mainly by iron-related defects) — mineral

Amethyst

Quartz, purple variety — silicon dioxide (SiO₂), colored mainly by iron-related defects

Black Agate (Chalcedony (SiO2)) — mineral

Black Agate

Chalcedony (SiO2)

Green aventurine beads (Quartz (SiO₂), typically green quartzite/aventurine with fuchsite mica inclusions) — mineral

Green aventurine beads

Quartz (SiO₂), typically green quartzite/aventurine with fuchsite mica inclusions

Yellow Quartz (Citrine Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Carnelian (a variety of Chalcedony) (Cryptocrystalline Quartz (SiO2) with iron oxide inclusions) — Mineral

Carnelian (a variety of Chalcedony)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Yellow Quartz (Citrine-colored Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine-colored Quartz Pebble)

Silicon Dioxide (SiO2)

Blue topaz cross pendant (Topaz, Al₂SiO₄(F,OH)₂; likely faceted blue topaz) — gemstone

Blue topaz cross pendant

Topaz, Al₂SiO₄(F,OH)₂; likely faceted blue topaz

Tiger's Eye (Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2) — metamorphic

Tiger's Eye

Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Tumbled yellow chalcedony (likely yellow agate or common opal) (Microcrystalline quartz, SiO₂ (chalcedony/agate); exact identification requires testing) — mineral

Tumbled yellow chalcedony (likely yellow agate or common opal)

Microcrystalline quartz, SiO₂ (chalcedony/agate); exact identification requires testing

Yellow quartz (likely lemon quartz/citrine) (Quartz, silicon dioxide (SiO₂); yellow coloration may be iron-related citrine or surface treatment) — mineral

Yellow quartz (likely lemon quartz/citrine)

Quartz, silicon dioxide (SiO₂); yellow coloration may be iron-related citrine or surface treatment

Raw citrine or iron-stained quartz fragment (Quartz, SiO₂; yellow color likely from iron impurities) — mineral

Raw citrine or iron-stained quartz fragment

Quartz, SiO₂; yellow color likely from iron impurities

Tumbled quartz (likely citrine or iron-stained quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Tumbled quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Carnelian Agate (Silicon Dioxide (SiO2) - variety Carnelian (Chalcedony)) — Mineral

Carnelian Agate

Silicon Dioxide (SiO2) - variety Carnelian (Chalcedony)

Rough Citrine Quartz (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Tumbled yellow quartz (likely citrine) (Quartz, silicon dioxide (SiO₂); yellow color may be natural citrine or heat-treated amethyst) — mineral

Tumbled yellow quartz (likely citrine)

Quartz, silicon dioxide (SiO₂); yellow color may be natural citrine or heat-treated amethyst

Turquoise (Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O) — gemstone

Turquoise

Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O