Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite-Gedrite in Quartz (Schist)
Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix
metamorphic
Milky Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony
Chalcedony (a microcrystalline variety of Quartz, SiO2)
Mineral
Granite
Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)
igneous
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary
Amber
Succinite (Fossilized Resin C10H16O)
Organic Mineraloid
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2 + tracing minerals
mineraloid / impactite
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Formation
sedimentary
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Anthracite Coal
Anthracite
metamorphic
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (C10H16O)
Organic Mineraloid
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Red Amber (Burmite/Cherry Amber)
Succinite / Retinite (Organic Fossilized Resin, C10H16O)
Mineraloid (Organic)
Quartz (pebble)
Quartz (SiO₂)
Mineral
Milky Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Gravel)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Calcite
Calcium Carbonate (CaCO3)
mineral
Amazonite
Triklinic Potassium Feldspar (KAlSi3O8)
mineral
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite
Organic (Mineraloid)
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Mineral/Rock
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary (or mineraloid)
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid