Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
Quartz (pebble)
Quartz (SiO₂)
Mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide cement)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary occurrence
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ironstone Concretion (likely)
Goethite/Hematite/Limonite cemented sediment
Sedimentary Rock
Unidentifiable Specimen
Undetermined
Unknown
Chert (Flint Nodular Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Chert (often referred to as Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Gneissic or Banded)
Clastic Sedimentary Rock (composed predominantly of SiO2)
sedimentary
Chert (Iron-rich or Jasperoid)
Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt Pebble
Basalt (Mafic volcanic rock)
Igneous
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Quartz (Clear/White)
Silicon Dioxide (SiO2)
mineral
Arkosic Sandstone
Arkose
sedimentary
Coarse-grained Granite (Quartz and Feldspar dominated)
Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)
Igneous
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Quartzite (Potentially Ferruginous)
Quartzite (SiO2)
metamorphic
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Native Copper Nugget
Native Copper (Cu)
mineral
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Riverstone / Cobble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Satin Spar (often marketed as Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Sandstone (with potential iron-oxide weathering)
Arenite (SiO2 based)
sedimentary
Chert (and Chalcedony/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite Pebble)
Arenite (SiO2)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral