Quartzite with Quartz Veining
Metamorphosed Sandstone (SiO2 with impurities)
metamorphic
Category
Carved Stone
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Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Gneiss
Gneiss
metamorphic
Unakite Granitoid
Unakite (Metasomatized Granite)
metamorphic
Greenstone
Metabasalt / Chlorite-actinolite-epidote schist
metamorphic
Pink Granite (River Pebble)
Felsic Intrusive Igneous Rock
igneous
Tumbled gray feldspar-rich stone, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite
igneous
Polished dark stone, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Zebra Jasper
Silicon Dioxide (SiO2)
metamorphic
Dalmatian Jasper
Dalmatian Stone (a porphyritic peralkaline igneous rock)
igneous
Porphyritic Basalt (Porphyry pebble)
Porphyritic Basalt / Amygdaloidal Basalt
igneous
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Likely tumbled basalt or dark volcanic rock
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Unakite
Epidotized Granite
metamorphic
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Unakite Epidote-Granite
Unakite (Epidotized Granite)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Greenstone
Metabasalt / Greenschist
metamorphic
Quartzite Pebble
Quartzite (SiO2 based)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Porphyritic Rhyolite
Rhyolite (Porphyritic)
igneous
Quartzite (Orthoquartzite)
SiO2 (Silicon Dioxide) with Iron Oxide inclusions
metamorphic
Wishing Stone (Graywacke with Quartz Vein)
Graywacke (immature sandstone) with a SiO2 (Quartz) intrusion
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Granite
Phaneritic intrusive igneous rock
igneous
River Stone (Green Quartzite)
Quartzite (Metamorphosed Sandstone)
metamorphic
Chert (Jasper/Agate)
Cryptocrystalline Quartz (SiO2)
sedimentary
Shiva Lingam
Cryptocrystalline Quartz (Jasperiod) with Iron Oxide (Fe2O3)
metamorphic
Quartzite
Quartzite (principally SiO2)
metamorphic
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Likely basalt (possibly a dark beach pebble)
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Limestone / Dolomite
Calcium Carbonate (CaCO3) / Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic
Dalmation Jasper
Dalmation Stone (perthitic feldspar with arfvedsonite)
igneous