Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
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Anthropogenic (Man Made Material)
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Porphyritic Basalt or Porphyritic Andesite
Porphyritic volcanic rock
igneous
Jasper and Epidote in Quartzite
Metamorphic rock containing microcrystalline quartz, epidote, and jasper
metamorphic
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Serpentine
Serpentine Group (Mg3Si2O5(OH)4)
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz (Yellow/Citrine variety or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Sandstone / Quartzite with Mineral Veins
Sedimentary rock (Quartz arenite with iron oxide/silica banding)
sedimentary
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Granodiorite
Phaneritic intrusive igneous rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2-dominated rock)
metamorphic
Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Yellow Quartz (Citrine Quartz / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
K2 Jasper (K2 Granite)
Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)
igneous
Sandstone (Limonitic/Iron-stained)
Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)
sedimentary
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate)
Granite / Quartz-Feldspar Aggregate
igneous
Unakite Jasper / Unakite
Altered Granite (containing Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Serpentine / Serpentinite
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Orange Calcite
Calcite (CaCO3)
mineral
Quartz Geode / Druzy Quartz Node
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pebble / Gravel Fragment
Clastic Rock Fragment
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
metamorphic
Quartzite (with Mica / Quartzite Schist)
SiO2 (Silica) with minor Muscovite Mica KAl2(AlSi3O10)(OH)2
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral