Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Onyx (Calcite Onyx / Mexican Onyx)
Calcium Carbonate (CaCO3)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Greenschist
Chlorite schist
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Greenschist
Chlorite schist
metamorphic
Mica
Mica group (often Muscovite or Biotite)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Greenschist
Chlorite schist
metamorphic
Labradorite
Labradorite (Plagioclase Feldspar Series - (Ca, Na)(Al, Si)4O8)
mineral
Sapphire
Corundum (Al2O3)
mineral
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
metamorphic
Quartz Pebble (Beach Agate / Chalcedony Pebble)
Silicon Dioxide (SiO2)
mineral
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Polished serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite; bowenite is a nickel-rich translucent variety
metamorphic
Quartzite (Quartz Vein)
SiO2 (Silicon Dioxide)
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Amethyst and Rose Quartz Beads
Crystalline Quartz (SiO2) with trace elements
gemstone
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Banded Iron Formation (Metamorphosed Jasper/Siltstone)
Ferruginous Quartzite or Jasperoid Siltstone
metamorphic
Granite Cobble
Granite (Porphyritic/Coarse-grained)
igneous
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Quartz Vein Pebble
Silicon dioxide (SiO2)
metamorphic
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions (Fe2O3)
metamorphic
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Polished pink granite pebble
Granite; primarily quartz, potassium feldspar, plagioclase, and minor biotite/hornblende
igneous
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)