Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Corundum (Sapphire in Matrix)
Aluminum Oxide (Al2O3)
mineral
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Pink Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2), Quartz
mineral
Tumbled Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
K-Feldspar / Granite Pegmatite
Potassium Feldspar (Microcline/Orthoclase) with Quartz
igneous
Gossan / Iron-Rich Weathered Rock
Hydrated Iron Oxides / Limonite / Goethite
mineral
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Scoria
Vesicular Mafic Igneous Rock
igneous
River Stone (Green Quartzite)
Quartzite (Metamorphosed Sandstone)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Pink Granite
Felsic Intrusive Igneous Rock
igneous
Pink Granite / K-Feldspar
Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)
igneous
Basalt Pebble
Extrusive igneous rock (Mafic)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Basalt
Basalt
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Brecciated Jasper or Chert
SiO2
Sedimentary/Metamorphic
Pumice or Tufa/Travertine
Pumice (if igneous) or Calcareous Tufa (if sedimentary)
igneous/sedimentary
Gossan (Iron Hat)
Limonitic Gossan (Fe-oxide/hydroxide complex)
igneous
Basalt
Basalt
igneous
Quartz pebble with iron stains
Macrocrystalline Quartz (SiO2)
mineral
Chalcedony with Quartz Crystals
Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Chert with Chalcedony/Quartz Vug
Cryptocrystalline Silica (SiO2)
sedimentary
Amethyst and Agate Geode Section
Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
sedimentary
Possible galena-bearing ore specimen
Uncertain from the image; galena is lead sulfide (PbS), but the specimen is not diagnostic
mineral
Likely weathered basalt with iron-oxide alteration
Basalt (fine-grained mafic volcanic rock), chiefly plagioclase and pyroxene with altered iron-bearing minerals
igneous
Amethyst crystal cluster
Amethyst, purple variety of quartz (SiO₂)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
The user-provided image does not contain a rock or mineral specimen
N/A
Weathered iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides
sedimentary
Weathered quartz-rich metamorphic rock
Likely quartzite or quartz-veined metamorphic rock, chiefly SiO₂ with iron-oxide staining
metamorphic
Milky quartz-rich rock
Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue
mineral