Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
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Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Beach Pebble (Basalt/Porphyry)
Weathered Basalt or Porphyry
igneous
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Jasper
Silicon dioxide (SiO2)
mineral
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Weathered granite or granitic gneiss pebble
Granite; primarily quartz, potassium feldspar, plagioclase, and mica
igneous
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Granite
Intrusive Igneous Rock
igneous
Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)
Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble
metamorphic
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
igneous
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Likely weathered iron-rich breccia or jasper
Silicified iron-oxide breccia; exact identification requires testing
sedimentary
Unidentified brown mineral/rock fragment
Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite
mineral
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Unakite
Epidotized Granite
metamorphic
Weathered granite fragment
Granite, primarily quartz, feldspar, and mica
igneous
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous