Granite
Intrusive Igneous Rock
igneous
Category
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Weathered conglomeratic rock, likely iron-stained sandstone
Probable ferruginous, clast-bearing sandstone; exact identification requires examination of a fresh surface
sedimentary
Jasper
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Weathered quartz-rich pebble
Likely milky quartz (SiO₂), possibly a quartz-rich vein fragment
mineral
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Intrusive igneous rock
igneous
Mixed rough mineral specimens, likely quartz-bearing rocks
Probable quartz (SiO₂), with possible feldspar, iron oxides, and altered host rock
mineral
Quartz-rich rock fragment
Likely quartz vein material, predominantly quartz (SiO₂); identification is tentative from the image
igneous
Granite
Felsic intrusive igneous rock
igneous
Red granite or granitic gneiss cobble
Quartz–feldspar–mica rock; likely granite, possibly gneiss
igneous
Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Polished brecciated jasper
Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), with iron-oxide staining
mineral
Amphibolite
Amphibolite, typically composed mainly of hornblende and plagioclase feldspar
metamorphic
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Glacial erratic boulder, probably granite or granitic gneiss
Granite–gneiss; mainly quartz, feldspar, and mica
igneous
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Sandstone or possibly a conglomerate
Arenite (if sandstone)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
N/A - Non-Geological Item
not a rock/mineral
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Likely weathered iron-rich breccia or jasper
Silicified iron-oxide breccia; exact identification requires testing
sedimentary
Weathered granite (likely)
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gray rock (possibly basalt or fine-grained granite)
Undetermined; no diagnostic minerals are visible
igneous
Granite
Felsic intrusive igneous rock
igneous
Weathered greenish rock fragment
Tentatively altered basalt or serpentinite; exact identification requires testing
igneous
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous