Snowflake Obsidian
Volcanic Glass with Spherulitic Cristobalite (SiO2)
igneous
Category
Mineral Health
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Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Septarian Nodule
Septarian Concretion
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Garnet (Almandine)
Almandine Fe3Al2(SiO4)3
mineral
Amazonite
Amazonite (KAlSi3O8 - Microcline)
mineral
Laterite
Laterite (Ferricrete)
sedimentary
Rock Salt (Halite)
Halite (Sodium Chloride, NaCl)
mineral
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Blue Dumortierite Quartz
Dumortierite Inclusions in Quartz (SiO2 with Al7(BO3)(SiO4)3O3)
mineral
Granite
Granite
Igneous
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Peach Aventurine
Silicon Dioxide (SiO2) with inclusions
metamorphic
Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
Bumblebee Jasper
Anhydrite-Aragonite mixture with Orpiment and Realgar
mineraloid
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Gneiss (Metamorphic Cobble)
Gneiss
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Unakite
Epidotized Granite
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (small fragment)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Yellow Aventurine
Quartz (Silicon Dioxide - SiO2) with inclusions of Mica
Mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Granite Pebble
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Tiger's Eye
Quartz (chalcedony) with crocidolite inclusions, SiO2
mineral