Milky Quartz
Silicon Dioxide (SiO2)
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 Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
sedimentary (alluvial deposit)
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Pink-and-white banded quartzite or jasper
Quartzite, primarily microcrystalline SiO₂, possibly iron-stained quartz/chalcedony
metamorphic
Greywacke (River Slikkenstone)
Greywacke (Impure Sandstone)
sedimentary
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Possible shale or slate fragment
Fine-grained clay-rich rock; possibly slate (low-grade metamorphosed shale)
metamorphic
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Granite Sand and Gravel Mix
Phaneritic Felsic Igneous Plutonic Assemblage
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Mica
Mica group (often Muscovite or Biotite)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
River Pebble (Quartz/Chert mix)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Fancy Jasper (Agate/Chert mix)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Tumbled dark pebble, likely basalt
Basalt, predominantly plagioclase feldspar and pyroxene, commonly with olivine or magnetite
igneous
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Tumbled Carnelian and Quartz Mix
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Mineral
Chert (Jasper/Agate mix)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Quartzite (or Yellow Jasper / Carnelian Chalcedony)
Silicon Dioxide (SiO2)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (Jasper/Agate mix)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Chert-Jasper mix)
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Iron-rich concretion or weathered ironstone
Goethite–hematite limonite aggregate; commonly described as limonite or ironstone
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Que Sera Stone (Llanite / Blue Quartz with Feldspar and Iron Oxides)
Porphyritic Rhyolite (Quartz-Feldspar Porphyry)
igneous
Pink Chalcedony (Agate/Jasper blend)
Silicon Dioxide (SiO₂)
mineral
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Dyed Quartz / Rose Quartz Imitation
Silicon Dioxide (SiO2) with artificial pigment
mineral
Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)
Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining
metamorphic
Pyrite
Iron Sulfide (FeS2)
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