Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Category
Organic (Non Rock)
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Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Amber
Succinite (fossilized resin)
mineral
Weathered dark flint (chert) pebble
Microcrystalline quartz (SiO₂), commonly called flint or chert
sedimentary
Vesicular Basalt (or Scoraceous Basalt)
Basalt with vesicular texture
igneous
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Fossilized Bone
Fossilized vertebrate bone
fossil
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (volcanic glass)
igneous
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone
Weathered iron-stained stone, likely graywacke or altered sandstone
Indeterminate lithic fragment; probable quartz-rich sandstone/graywacke with iron-oxide staining
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Black glassy volcanic rock, likely scoria or obsidian
Vesicular basaltic scoria (probable); possibly dark obsidian
igneous
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Pearl necklace
Pearl: biogenic calcium carbonate, primarily aragonite (CaCO₃), in a conchiolin matrix
gemstone
Scoria
Mafic to intermediate volcanic rock
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Baltic Amber (Black)
Succinite (Fossilized Tree Resin)
fossil
Melo Melo Pearl (or Golden Chalcedony / Yellow Jasper Sphere)
Non-nacreous calcium carbonate pearl (or SiO2 - Silicon Dioxide)
gemstone
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Fossilized Bone in Matrix
Vertebrata fossil
fossil
Pearl
Nacre (aragonite, CaCO₃, with conchiolin)
gemstone
Unidentified gray rock fragment
Indeterminate from image; possibly quartz- or feldspar-rich silicate material
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic