Unakite Jasper / Unakite
Altered Granite (containing Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Serpentine
Antigorite/Chrysotile group (Mg3Si2O5(OH)4)
metamorphic
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Diorite
Phaneritic intermediate plutonic rock
igneous
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Rhyolite
Rhyolite (felsic volcanic rock)
igneous
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Weathered porphyritic volcanic rock (likely andesite or basalt)
Aphanitic to porphyritic andesite–basalt; composition commonly plagioclase, pyroxene, and minor iron oxides
igneous
Black obsidian (probable)
Volcanic glass; primarily SiO₂-rich rhyolitic composition
igneous
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Chert
Sedimentary Rock (CaCO3 with SiO2 inclusions)
sedimentary
Basalt
Basalt
igneous
Granite Pebble
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Limestone (Grey and White specimens)
Calcium Carbonate (CaCO3)
sedimentary
Iron-rich breccia
Hematite–goethite-rich ferruginous breccia, likely a lateritic ironstone
sedimentary
Weathered volcanic rock, likely andesite or basalt
Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals
igneous
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Banded gneiss, probably granitic gneiss
Foliated gneiss composed mainly of quartz (SiO₂), feldspar—orthoclase/microcline and plagioclase—and dark mica, commonly biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
metamorphic
Dark weathered pebble, likely basalt
Basalt (fine-grained mafic volcanic rock; typically plagioclase, pyroxene, and olivine)
igneous
Red Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
Mineral / Sedimentary Rock
Basalt
Basalt
igneous
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Quartz-bearing metamorphic rock, likely garnet-mica schist
Quartz–mica schist with probable garnet and iron-oxide minerals
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, possibly with iron-oxide staining and minor feldspar or mica
metamorphic
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Dark river pebble, likely basalt or fine-grained volcanic rock
Basalt (probable); mostly plagioclase and pyroxene, with possible magnetite
igneous
Granite
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Dark mafic rock, likely basalt
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine
igneous
Rounded white pebble, likely quartz-rich rock
Most consistent with quartzite or milky-quartz pebble; exact identification requires testing
sedimentary
Tumbled or rough turquoise-like specimen
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the image
mineral