Granite (Pink/Red Orthoclase variety)
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Artifact)
Chert (SiO2)
sedimentary
Porphyritic Andesite
Andesite (Porphyry)
igneous
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary
Hematite
Hematite (Fe2O3)
Mineral
Chert (Agatized Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
River Stone / Siltstone
Siltstone (composed of lithified silt)
sedimentary
Granitic Pegmatite
Granite (with coarse-grained Quartz, Feldspar, and Mica components)
igneous
Jasper in Rhyolite matrix
Silicon Dioxide (SiO2) with various inclusions in Felsic Igneous matrix
igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
sedimentary
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)
metamorphic
Native Gold (in earring form)
Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Gold Nugget
Native Gold (Au)
mineral
Chert (Common Opal/Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Granitic Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Brown Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO2)
Mineral, specifically a variety of Quartz
Smoky Quartz in Matrix
Silicon dioxide (SiO2) within Pegmatite/Gneiss
igneous
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Basalt (Mixed Breccia or Chert)
Silicon Dioxide (SiO2) with Ferromagnesian silicates
sedimentary and igneous (mixed)
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Botryoidal Hematite (Kidney Ore)
Hematite (Fe2O3)
Mineral
Oolitic Limestone (Oolite)
Oolitic Limestone (primarily Calcium Carbonate, CaCO3)
sedimentary
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous