Pyrite (Fool's Gold) Ore
Iron Disulfide (FeS2)
mineral
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Amber
Resinite / Fossilized Tree Resin
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diorite
Plutonic Igneous Rock (Intermediate Composition)
Igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)
sedimentary
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granitoid
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dragon Blood Jasper (Epidote with Piedmontite or Quartz)
Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
metamorphic
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Rough Aquamarine
Beryl (Be₃Al₂Si₆O‑₁₈)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Gold Nugget
Native Gold (Au)
mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Granite
Phaneritic Plutonic Igneous Rock (Rich in SiO2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Piddock bored rock (Boring Stone)
Ichnofossil-bearing Limestone or Mudstone (trace fossils by Pholadidae)
sedimentary
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
River Pebbles (Sandstone and Quartzite)
SiO2 (Quartz) dominated clastic rocks
sedimentary and metamorphic
Aragonite
Aragonite (Carbonate mineral), CaCO3
mineral
Chert Geode with Quartz Druzy
Microcrystalline Quartz (SiO2) with macrocrystalline Quartz
sedimentary
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral