Quartz-rich river pebble, likely milky quartz
Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble
mineral
Category
Igneous, Sedimentary, And Metamorphic Mix
Browse igneous, sedimentary, and metamorphic mix specimens identified by the Rock Identifier community.
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River Pebble (Quartz/Chert mix)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Fancy Jasper (Agate/Chert mix)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Greywacke (River Slikkenstone)
Greywacke (Impure Sandstone)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Quartz pebble
Silicon dioxide (SiO2)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Mica
Mica group (often Muscovite or Biotite)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Vesicular Basalt
igneous
Mixed rock and mineral collection
Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials
mineral
River Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
sedimentary (alluvial deposit)
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Pink-and-white banded quartzite or jasper
Quartzite, primarily microcrystalline SiO₂, possibly iron-stained quartz/chalcedony
metamorphic
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Serpentine
Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4
metamorphic
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Polymictic Conglomerate
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Quartz-rich rock, possibly quartzite
Quartzite (dominantly quartz, SiO₂); identification is provisional from the photo
metamorphic
Tumbled basalt pebble
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine
igneous
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Iron-rich concretion or weathered ironstone
Goethite–hematite limonite aggregate; commonly described as limonite or ironstone
sedimentary
Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)
Silicon Dioxide (SiO2) or Mafic extrusive igneous rock
sedimentary or igneous
Possible shale or slate fragment
Fine-grained clay-rich rock; possibly slate (low-grade metamorphosed shale)
metamorphic
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral