Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions
sedimentary
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Aragonite Star Cluster
Aragonite (Calcium Carbonate - CaCO3)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Mineral
Native Gold
Native Gold (Au)
mineral
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Honey Calcite (Yellow Calcite)
Calcium Carbonate (CaCO3)
mineral
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Arsenic (Native)
Arsenic (As)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Unakite
Epidotized Granite
metamorphic
Botryoidal Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Chalcedony mix)
sedimentary
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8
Mineral
Greenschist
Greenschist facies rock
Metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granite (Pink/Potassium-rich)
Pink Granite (contains K-Feldspar, Quartz, and Plagioclase)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Granite
Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)
igneous
Carnelian
Carnelian (Silicon Dioxide: SiO2)
mineral
Oolitic Limestone
Oolite (Sedimentary Calcium Carbonate)
sedimentary
Granite
Phaneritic plutonic rock (SiO2 range 70-75%)
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Dragon Blood Jasper
Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Ferruginous Sandstone Pebble
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)
sedimentary
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic