Fossiliferous Kalkstein (Marl/Sandstone)
Fossiliferous calcarenite/siltstone
sedimentary
Category
Not A Geological Specimen
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Chert (with possible fossils)
Microcrystalline quartz (SiO2)
sedimentary
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Red Jasper (Amygdaloidal Basalt with Agate)
Silicon dioxide (SiO2) in Basalt host
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Granite Water-Worn Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Microcrystalline variety)
Silicon Dioxide (SiO2)
mineral
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Basalt inclusion
Silicon Dioxide (SiO2) with mafic silicate rock
igneous and sedimentary/metamorphic mix
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert with Limestone Cortex
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Quartz (specifically Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Dyed Tumbled Quartz
Silicon Dioxide (SiO2) with artificial pigment
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky and Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert Breccia
Brecciated Chert (Microcrystalline SiO2)
sedimentary
Pyrite (Fools Gold)
Iron Sulfide (FeS2)
mineral
Bumble Bee Jasper
Calcite and Volcanic Ash Mixture
sedimentary
Rose Quartz (Aura Quartz)
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartz / River Cobble
Silicon Dioxide (SiO2)
mineral
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mineral and Rock Collection (Assorted)
Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine
mineral
White Quartz (Carved or Tumbled)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Gobi Eyes or Eye Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral