Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
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Chert (Iron-stained)
Microcrystalline Silica (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Chert (Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Yellow variety)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentinite (likely serpentine-rich metamorphic rock)
Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly derived from altered peridotite
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Sapphire (possibly Yellow/Green Corundum)
Corundum (Al2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Basalt (Mafic Volcanic Rock)
igneous
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Sandstone
Arenite (SiO2 dominant)
sedimentary
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Jadeite (Nephrite)
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Concretion
Sedimentary Concretion
sedimentary
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony
Chalcedony (a microcrystalline variety of Quartz, SiO2)
Mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with Glauconitic or Iron staining
Quartzite (SiO2 with accessory minerals)
metamorphic
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Quartz (SiO₂), variety Rose Quartz
Mineral
Glauconitic Sandstone (Greensand)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Chert Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Quartz Geode (River Cobble)
Silicon Dioxide (SiO2)
mineral
Chert (variations include Flint/Jasper)
Chert (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (with Iron Oxide staining)
Clastic Sedimentary Rock - Quartz Arenite/Wacke
sedimentary
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Unakite / Epidosite
Epidote with Orthoclase and Quartz; (Ca2(Al2,Fe)(SiO4)3(OH)) / (KAlSi3O8) / (SiO2)
metamorphic