Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Category
Mineral In A Matrix (Likely Quartz Or Feldspar)
Browse mineral in a matrix (likely quartz or feldspar) specimens identified by the Rock Identifier community.
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (composed primarily of Fluorapatite)
mineral
Granite
Granite
Igneous
Conglomerate with Quartzite Pebbles
Clastic sedimentary rock (Conglomerate)
sedimentary
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz with Tourmaline Inclusions (Tourmalinated Quartz)
SiO2 with complex borosilicate inclusions
Mineral
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
sedimentary
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Pink Granite
Phaneritic Plutonic Felsic Igneous Rock (Granite)
igneous
Andesite
Andesite (Intermediate Extrusive Igneous Rock)
igneous
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with various inclusions
mineral
Porphyry
Porphyritic Andesite/Basalt
igneous
Granite Pebble (Salt and Pepper Granite)
Felsic Intrusive Igneous Rock (Granite)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock)
Igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Granodiorite (or Granite) Pebble
Phaneritic Felsic Igneous Pebble
igneous
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Cinnabar in Quartz
Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)
mineral
Chalcedony Nodule in Matrix
Silicon Dioxide (SiO2)
mineral
Granite or Pegmatite with Mica
Granitoid
igneous
Quartz Veined Siltstone or Graywacke
Clastic Sedimentary Rock with Quartz (SiO2) veining
sedimentary
Granite Cobble
Granite
igneous
Porphyritic Andesite
Andesite (porphyritic variety)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Vesicular Basalt with Quartz
Vesicular Basalt (SiO2 inclusions)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Amazonite
Potassium aluminum silicate (Microcline); KAlSi3O8
mineral
Amazonite
Potassium Feldspar (Microcline) - KAlSi3O8
mineral
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt with Andalusite or Feldspar laths
igneous
Porphyritic Basalt (Chinese Writing Stone or Flower Stone)
Porphyritic Basalt / Porphyry
igneous
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral