Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
Category
Browse mineral like industrial smelting waste specimens identified by the Rock Identifier community.
Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
Sandstone
Arenite (lithic or quartz sandstone)
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
Milky Quartz (river pebble)
Quartz (Silicon Dioxide, SiO2)
Satin Spar (often marketed as Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Bismuth Crystal
Bismuth (Bi)
Greenschist
Chlorite Schist
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
Arsenopyrite
Arsenopyrite (FeAsS)
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with various inclusions
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
Kimberlite with Diamond
Kimberlite (Porphyritic Peridotite)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Limonite and Goethite on Gossan
FeO(OH)·nH2O
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
Feldspar-rich Quartzite
Feldspathic Quartzite (Metamorphosed Sandstone)
Basalt with Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
Ruby
Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
Schist
Schist
Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with inclusions (Chlorite, Feldspar, Goethite, Hematite)
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Concretion (Sandstone)
Sandstone Concretion
Greenstone
Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
Bauxite
Bauxite (Aluminum Ore)
Greenstone
Metabasalt / Chlorite Schist
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Flower Agate
Chalcedony (SiO2) with Platy inclusions