Jasper with Quartz Vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Sandstone
Arenite (a specific type of sandstone with less than 15% matrix)
Sedimentary rock
Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Black Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
igneous
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Diorite
Diorite (an intrusive igneous rock)
igneous
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Pebble (river rock/beach pebble)
Pebble (clast size class)
Sedimentary Rock
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Quartz (Gravel fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Green Fluorite in Host Rock
Fluorite (Calcium Fluoride, CaF2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite Cobble (River Stone)
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
igneous
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Basalt (River Pebble)
Basalt
igneous
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Pink Granite
Phaneritic plutonic rock (dominated by Alkali Feldspar)
igneous
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Jasper Agate (specifically Brecciated Jasper with Agate inclusions)
Silicon Dioxide (SiO2)
mineral
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
sedimentary
Goldstone (Red)
Aventurine Glass (SiO2 + Cu)
Synthetic Glass (Often categorized as a simulated mineral)
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Petrified Wood (Silicified Wood)
Silicified Wood / Silicon Dioxide (SiO2)
metamorphic
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic