Chert Pebble (Jasper/Quartz variety)
Microcrystalline Quartz (SiO2)
sedimentary
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.
Porphyritic Rhyolite
Rhyolite (Porphyritic texture)
igneous
Granite with Orthoclase and Hematite Staining
Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Porphyritic Basalt
Amygdaloidal Porphyritic Basalt
Igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with high iron inclusion
sedimentary
Granitic Pegmatite with Schorl
Granitic Pegmatite (NaAlSi3O8, KAlSi3O8, SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
mineral
Granitoid Pebble (Graphic Granite/Pegmatite)
Pegmatitic Granite with Quartz and Orthoclase
igneous
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Granite Cobble
Granite (Phaneritic Quartz-Feldspar-Mica intrusive rock)
igneous
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Dalmatian Stone
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
River Quartz Pitting/Cobble
Silicon Dioxide (SiO2)
mineral
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Granite (Weathered/Oxidized)
Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)
igneous
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Dalmatian Stone
Dalmatian Stone (a peralkaline igneous rock consisting of Feldspar, Quartz, and Arfvedsonite)
igneous
Granitoid (Granite/Diorite)
Course-grained Plutonic Igneous Rock
igneous
Graphic Granite
Pegmatitic Feldspar with Quartz intergrowths
igneous
Andesite Porphyry
Andesite (Intermediate Volcanic Rock)
igneous
Porphyritic Andesite
Andesite (Porphyry)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Porphyritic Basalt (or Andesite) Pebble
Porphyritic Mafic Volcanic Rock
igneous
Amazonite (or Amazon Stone)
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Porphyritic Rhyolite (Red Rhyolite)
Rhyolite (Porphyry)
igneous
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Greywacke
Greywacke sandstone
sedimentary
Gneiss (likely)
Gneiss
Metamorphic
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Garden Quartz (Shaman Quartz)
Silicon Dioxide (SiO2) with various inclusions (Hematite, Chlorite, Feldspar)
mineral
Schorl (Black Tourmaline) in Quartz Matrix
Schorl: NaFe3Al6(BO3)3Si6O18(OH)4 (Complex Borosilicate)
mineral
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous