Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
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Granite
Phaneritic Felsic Igneous Rock
igneous
Scoria
Extrusive Igneous Rock
igneous
Granite
Phaneritic felsic intrusive igneous rock
igneous
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Granodiorite
Phaneritic intrusive igneous rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Rhyolite
Extrusive Felsic Igneous Rock
igneous
Basalt
Extrusive igneous rock (Mafic)
igneous
Sunstone Beads
Feldspar group (Oligoclase / Labradorite)
gemstone
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite / Arkose)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Celestite
Celestine (SrSO4)
mineral
K-Feldspar Granite Fragment
Granite (Alkali Feldspar-rich)
igneous
Marble
Metamorphic carbonate rock (primarily recrystallized calcite, CaCO3)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2 with iron oxide impurities)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Pink Granite
Felsic Intrusive Igneous Rock
igneous
Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Jasper and Quartzite Breccia
Silicified sedimentary breccia
sedimentary
Fossilized Coral
Rugose Coral (Order Rugosa) or Tabulate Coral
fossil
Heliotrope (Bloodstone)
Chalcedony quartz variety (SiO2) with hematite or jasper inclusions
mineral
Quartzite
Metamorphic Quartz Rock
metamorphic
Granite Pebble
Intrusive Igneous Rock
igneous
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
mineral
Mixed River Pebbles and Jasper
Siliciclastic sediment and microcrystalline quartz
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Granite
Plutonic Igneous Rock
igneous
Eclogite
Omphacite-Pyrope Eclogite
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil
Dalmatian Jasper
Microgranular quartz with amphibole/tourmaline inclusions
igneous
White Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Pink Quartz
Silicon Dioxide (SiO2)
mineral