Milky Quartz (Water-Worn Cobble)
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.
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Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Granite river rock
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Diamond
Diamond (Native Carbon, C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral (occurring as a rolled clast)
Chalcedony (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite (with Quartz Veining)
Quartzite (SiO2)
metamorphic
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
Igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Limonite with Galena
FeO(OH)·nH2O (Limonite) and PbS (Galena)
mineral
Quartz (with Iron staining)
Silicon Dioxide (SiO2)
mineral
Snakeskin Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Basalt (with possible weathering)
Basalt
igneous
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Limestone River Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
igneous