Pumice
Pumice (Amorphous volcanic glass)
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
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Granite
Granite (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
River Pebble (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Serpentinite
Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Jasper and Agate
Microcrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Scoria
Scoriaceous Basalt
igneous
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Crushed Limestone
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Quartzite
Metamorphic rock (primarily SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Extrusive Igneous Rock)
igneous
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Blue Sapphire
Corundum (Al2O3)
mineral
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Almandine Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Vesicular Basalt
Extrusive mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Quartzite River Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Pink Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Weathered dark rock fragment
Indeterminate; possibly basalt or iron-rich volcanic rock
igneous