Agate
Chalcedony (SiO2)
mineral
Category
Sedimentary Or Igneous
Browse sedimentary or igneous specimens identified by the Rock Identifier community.
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White Quartz
Silicon Dioxide (SiO2)
mineral
Fuchsite (Green Muscovite / Mica Schist)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Pebble Gravel Mix (Quartzite, Basalt, Chert)
Alluvial River Gravel / Aggregate Clasts
sedimentary
Rough Quartz (Milky / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Grey Banded Agate
Silicon Dioxide (SiO2)
sedimentary
Magnetite or Hematite Nodule
Iron Oxide (Fe3O4 or Fe2O3)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Massive White Quartz
Silicon Dioxide (SiO2)
mineral
Mineral and Rock Collection (Assorted)
Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine
mineral
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Assorted Tumbled Gemstones
Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Yellow variety)
Silicon Dioxide (SiO2)
mineral
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Hematite
Hematite, Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Agate
Banded Chalcedony (SiO2)
mineral
Hematite Ball
Iron(III) oxide (Fe2O3)
mineral
Weathered sandstone fragment
Clastic sandstone, likely quartz-rich (quartz arenite or arkose)
sedimentary
Pyrite
Iron Pyrite (FeS₂)
Mineral
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Granite
Felsic intrusive igneous rock
igneous
Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
Sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
River Stone (Basalt or Siltstone with banding)
Polished Basaltic or Siliciclastic River Cobble
igneous or sedimentary
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Dalmatian Jasper (Dyed Blue)
Peralkaline Rock with Arfvedsonite and Blue Dye
igneous
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
White Agate / Chalcedony
Silicon Dioxide (SiO2)
gemstone
Quartz Pebble
Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz River Rock
Silicon Dioxide (SiO2)
mineral