Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Category
Man Made Object (Simulant)
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Black Onyx
Cryptocrystalline Quartz (SiO2) with carbon/iron impurities
mineral/sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Onyx (Black Onyx)
Silicon Dioxide (SiO2) - Chalcedony variety
Mineral
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Botryoidal quartz (likely chalcedony or druzy quartz)
Silicon dioxide, SiO₂; microcrystalline quartz (chalcedony) with possible drusy quartz coating
mineral
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Thunderegg (Agate or Quartz Geode)
Silica-filled rhyolitic nodule (SiO2)
sedimentary
Basalt River Pebble
Aphanitic Mafic Igneous Rock
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz with Hematite/Limonite staining
Silicon Dioxide (SiO2)
mineral
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Coral Fossil
Anthozoa (Scleractinia)
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Feldspar (specifically Orthoclase or Plagioclase)
Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Chalcedony (Blue Dragon/Gray Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Chert / Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite/Hematite-Chert)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral