Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
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Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Epidosite
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Copper Ore
Mixed copper sulfides/oxides in gangue matrix
mineral
Tumbled jasper or chert pebble
Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide staining
sedimentary
Weathered granite or granitic gneiss
Granite; chiefly quartz, feldspar, and mica, with iron-oxide weathering
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Mixed Quartz and Aventurine Chips
Silicon Dioxide (SiO2) with various inclusions
mineral
Mixed stream gravel and cobbles
Polylithic alluvial deposit; individual clasts are not identifiable at this resolution
sedimentary
Polished hematite
Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen
mineral
Olivine in Quartz/Feldspar Matrix (Peridotite or Granitic Pegmatite)
(Mg,Fe)2SiO4 (Olivine) with Quartz / Feldspar
igneous
Greywacke
Lithic Sandstone (Greywacke)
sedimentary
Porphyritic granite pebble
Granite, chiefly quartz (SiO₂), alkali feldspar and plagioclase, with minor biotite/hornblende
igneous
Granitic Quartz or Pegmatite
Quartz with Orthoclase Feldspar (SiO2 + KAlSi3O8)
igneous
Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chalcedony Agate / Carnelian nodules in Matrix
SiO2 (Silicon Dioxide) with iron oxide inclusions
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Mixed Gravel and Pebbles
Polylithic Alluvial Aggregate
igneous, sedimentary, and metamorphic mix
Carved Stone Turtle
Mixed stone carving
carved stone
Chakra Crystal Bracelet
Mixed Mineral Assortment
gemstone
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite/Tourmaline inclusions
igneous
Jasper and Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz variety
sedimentary
Green Gneiss
Metamorphic Gneiss
metamorphic
Mixed rock fragments, likely basalt and weathered granite
Basalt (mafic volcanic rock) and granitic fragments (quartz–feldspar–mica aggregate)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone (Quartz with Glauconite)
sedimentary
Graywacke (River Cobble)
Graywacke (Lithic Sandstone)
sedimentary
Yellow Chert (Chert / Jasper)
Silicon Dioxide (SiO2 / Microcrystalline Quartz)
sedimentary
Snowflake Obsidian (possibly mixed with Jasper or other matrix)
Obsidian with Cristobalite inclusions
igneous
Mixed landscaping gravel with a pink granite cobble
Primarily granite (quartz, alkali feldspar, plagioclase, biotite); mixed pebble assemblage
igneous
Mixed rounded stream pebbles
Most appear to be granitic and mafic igneous rocks, including granite, gneiss, basalt, and possibly quartzite; exact identification is uncertain from the image.
igneous
Turquoise and Hematite
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)
mineral
Dalmatian Jasper
Peralkaline rhyolite
igneous
Yellow Jasper
Jasper (Silicon Dioxide with Iron Hydroxide impurities, SiO2 + FeO(OH))
sedimentary
Likely gray granite fragment
Granite, composed mainly of quartz, feldspar, and mica
igneous
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
igneous