Quartz pebble with iron staining
SiO2
mineral
Category
Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)
Browse mixed (igneous, sedimentary, metamorphic, and minerals) specimens identified by the Rock Identifier community.
Learn about Mixed (Igneous, Sedimentary, Metamorphic, And Minerals) in the encyclopedia
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Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
mineral
Tumbled quartz pebble, possibly citrine or pale smoky quartz
Quartz (SiO₂), likely microcrystalline/tumbled material
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Gneiss
Gneiss
metamorphic
Crushed Granite and Quartz Gravel
Composite Igneous and Silicate Rock Aggregate
igneous
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Small quartz-rich pebble or rock fragment
Quartz (silicon dioxide, SiO₂), possibly with iron-oxide staining or host-rock inclusions
mineral
Mixed stream gravel and cobbles
Polylithic alluvial deposit; individual clasts are not identifiable at this resolution
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Loadstone candidate)
Iron(II,III) oxide (Fe3O4)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Mixed River Pebbles (Jasper, Hematite, and Quartzites)
Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)
sedimentary
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
mineral
Weathered metallic sulfide-bearing rock, possibly pyrite-rich ore
Tentatively pyrite (FeS₂) with iron oxides and host rock; exact identification requires testing
mineral
Copper Ore (Malachite and Limonite bearing)
Cuprite, Malachite, and Limonite mixture
mineral
Purple Lepidolite with Quartz
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Azurite Malachite (Mixed)
Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
Granite Gneiss
Granitic Gneiss
Metamorphic
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Tumbled granite or granitic gneiss
Granite, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic