Emerald / Fluorite
Beryl (Be3Al2Si6O18) / Fluorite (CaF2)
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Howlite
Ca2B5SiO9(OH)5 (Calcium borosilicate hydroxide)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Bismuth
Bismuth (element Bi) with oxidized thin-film interference layer
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Porphyritic Igneous Rock / Rhyolite Porphyry
Porphyritic volcanic rock
igneous
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Fancy Jasper (Butterfly Carving)
Silicon Dioxide (SiO2) with iron and manganese inclusions
sedimentary
Sulfur on Aragonite
Sulfur (S) and Aragonite (CaCO3)
Mineral
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with Iron inclusions)
sedimentary
River Pebble (Brecciated Chert/Siltstone)
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Quartz with inclusions
SiO2
mineral
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Chert / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Obsidian (likely Golden Sheen Obsidian or Rainbow Obsidian, given the subtle sheen visible on some beads)
Obsidian (volcanic glass, predominantly SiO2 with various impurities)
Igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Gold Nugget / Native Gold
Native Gold (Au)
mineral
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2 with iron oxide impurities)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary/mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Gold Nugget
Native Gold (Au)
mineral
Rough Citrine Quartz
Citrine (Silicon Dioxide, SiO2 with iron impurities)
mineral
Gold Mineral
Native Gold (Au)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass