Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia
Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Pebble / Gravel Fragment
Clastic Rock Fragment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Clam)
Class Bivalvia, likely Mercenaria or similar genus
fossil
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Quartz Arenite / Sedimentary Rock
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Muscovite Mica
Muscovite KAl2(AlSi3O10)(OH)2
mineral
Sandstone
Arenite
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Crushed Granite and Quartz Gravel
Composite Igneous and Silicate Rock Aggregate
igneous
Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Polished amethyst pyramid
Amethyst, purple quartz (SiO₂)
mineral
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Garnet Gemstone
Pyrope-Almandine Garnet (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
gemstone
Small rounded pebble, likely quartz-rich stone
Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Diorite (Polished Tumble)
Diorite (Intermediate intrusive igneous rock)
Igneous
Veined Pebble (Septarian or Quartz-Veined Chert/Basalt)
Silicon Dioxide (SiO2) veins in matrix
sedimentary
Chert (also known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (potentially Jasper/Common Opal mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Diamond
Carbon (C)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral