Chalcedony (Commonly known as Carnelian or Agate pebble)
Microcrystalline Quartz (SiO2)
mineral
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.
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Ferruginous Quartzite (Iron-stained Quartzite)
Quartzite with Iron oxides (FeO(OH) / Fe2O3)
metamorphic
Chrysocolla on Limonite Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)
mineral
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)
metamorphic
Puddingstone (Jasper Conglomerate)
Jasper Conglomerate (SiO2 matrix with Fe2O3 inclusions)
sedimentary
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Diamond in Kimberlite
Kimberlite host rock with C (Carbon) inclusion
igneous
Orange Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Crushed Limestone and Calcite
Calcium Carbonate (CaCO3)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Granodiorite
Granodiorite
igneous
Dragon Blood Jasper
Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Granite
Phaneritic Plutonic Igneous Rock
igneous
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Granodiorite
Granodiorite
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Amygdaloidal Rhyolite
Amygdaloidal Rhyolite (Felsic volcanic rock)
igneous
Dalmatian Stone
Dalmatian Jasper (actually a Peralkaline Igneous Rock)
igneous
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Quartz / Quartzite Pebble
Silicon Dioxide (SiO2)
metamorphic
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous