Black Opal
Hydrated Amorphous Silica (SiO2 "n" H2O)
gemstone
Category
Organic (Non Rock)
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Quartzite with Quartz Veins
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Limestone (Carved Statue)
Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Fossilized Tree Resin
gemstone
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Banded Quartzite Cobble
Quartzite (SiO2 with minor iron oxides)
metamorphic
Tumbled green aventurine (likely)
Quartz (SiO₂) with fuchsite or other green mica inclusions
mineral
Chert (White Variety)
Microcrystalline Silica (SiO2)
sedimentary
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Quartzite pebble
Quartzite (SiO2 with trace iron/feldspar)
metamorphic
Pearl
Calcium carbonate (CaCO3) + organic conchiolin
gemstone
Chert (Flint)
Chert (SiO2)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite / Sandstone
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Garnet (Melanite)
Andradite, Ca3Fe2(SiO4)3
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Flint)
Cryptocrystalline quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Chalcedony/Common Opal)
Microcrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (White/Gray variety)
Silicon Dioxide (SiO2 / Cryptocrystalline Quartz)
sedimentary
Larimar
Blue Pectolite (NaCa2Si3O8(OH))
mineral
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone