Basalt with Olivine Phenocrysts
Porphyritic Basalt (containing Mg2SiO4 - Fe2SiO4)
igneous
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Schist
Mica Schist
metamorphic
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Granodiorite
Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)
igneous
Fluorite and Rose Quartz
Fluorite (CaF2), Rose Quartz (SiO2)
Mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Ambergris
Ambra grisea
Organic (often found by beachcombers)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Scoria (Vesicular Basalt)
Scoria (Extrusive Igneous Rock)
igneous
Ferruginous Sandstone
Arenite with Iron-Oxide cement (Fe2O3 · nH2O)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide cement)
sedimentary
Agate
Cryptocrystalline Quartz (SiO2)
mineral
Granite (with alteration)
Granite (Felsic intrusive igneous rock)
igneous
Porphyritic Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Pink Dyed Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Diamond
Diamond (C)
Mineral
Milky Quartz (Vein 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
Gold Nugget
Native Gold (Au)
mineral
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Rose Quartz
Silicon dioxide (SiO2)
mineral
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Rose Quartz
Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese
mineral
Agate (Geode nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
Igneous rock
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary