Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Category
This Image Does Not Display A Rock, Mineral, Or Geological Specimen. It Shows A Human Hand Wearing A Ring.
Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Mica Schist
Mica Schist (primarily Muscovite and Biotite phyllosilicates)
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Wonderstone (Liesegang Sandstone)
Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))
sedimentary
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Dalmatian Jasper
Peralkaline rhyolite
igneous
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Granite
Intrusive Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Common Opal
Hydrated silica (SiO2 " nH2O)
mineral
Granite (specifically Pink or Red Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Citrine
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
mineral
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (and/or Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Coarse-grained Jasper or Jasper Conglomerate
Silicon Dioxide with Iron Oxide (SiO2) + Fe2O3
sedimentary
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Agate (or Chalcedony)
SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz
Mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Jasper-Agate Breccia
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
sedimentary
Flower Agate
Chalcedony (cryptocrystalline Quartz) with Spherulite inclusions; SiO2
mineral