Quartz Vein with Sulfides
Silicon Dioxide with Pyrite and Tourmaline (SiO2)
mineral
Category
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Generic Rock Fragment
Rock Fragment
sedimentary
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Quartz vein in mica-rich host rock
Milky quartz (SiO₂) in a mica-rich metamorphic matrix, likely schist
metamorphic
Weathered conglomeratic rock, likely iron-stained sandstone
Probable ferruginous, clast-bearing sandstone; exact identification requires examination of a fresh surface
sedimentary
Quartz Vein in Sandstone
Quartzite veined quartz arenite
sedimentary
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Polished granite pebble
Granite, a coarse-grained felsic plutonic rock composed mainly of quartz, feldspar, and mica
igneous
Red granite or granitic gneiss cobble
Quartz–feldspar–mica rock; likely granite, possibly gneiss
igneous
Granite
Felsic intrusive igneous rock
igneous
Sandstone or possibly a conglomerate
Arenite (if sandstone)
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Likely serpentinite (serpentine-rich rock)
Serpentinite, composed mainly of serpentine-group minerals (lizardite, antigorite, or chrysotile); identification from the photo is tentative.
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Iron-stained quartz-rich rock (possibly ironstone)
Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Amphibolite
Amphibolite, typically composed mainly of hornblende and plagioclase feldspar
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Tumbled granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Schist
Metamorphic Rock
metamorphic
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Pyrite in Quartz
Iron Sulfide in Silicon Dioxide (FeS2 + SiO2)
mineral
Weathered greenish rock fragment
Tentatively altered basalt or serpentinite; exact identification requires testing
igneous
Glacial erratic boulder, probably granite or granitic gneiss
Granite–gneiss; mainly quartz, feldspar, and mica
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive igneous rock
igneous
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
metamorphic
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Granite Pebble
Granite
igneous