Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Category
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Chert (specifically Gray/Tan Chert Node)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
metamorphic
Moqui Marble
Hematite Concretion (Iron Oxide Concretion)
sedimentary
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Tiger's Eye (Oeil de Tigre)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Shungite
Non-crystalline carbon (similar to anthracite coal or meta-anthracite)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Blue Agate (Dyed)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Chert (Jasper variety)
Silicon dioxide (SiO2)
sedimentary
Rough Green Sapphire (Corundum)
Corundum (Al2O3 - Aluminum Oxide with trace elements)
mineral
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
sedimentary
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Dyed Quartzite (Pink/Magenta)
Silicon Dioxide (SiO2) - Artificially Colored Quartzite
mineral
Chert (Quartz Variety)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Weathered sandstone or arkosic sandstone
Clastic sandstone, likely quartz–feldspar-rich (arkose)
sedimentary
Quartzite Geode or Crystalline Quartz Node
Silicon Dioxide (SiO2)
metamorphic
Conglomerate
Sedimentary Conglomerate
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Raw Sapphire (Corundum)
Aluminum oxide (Al2O3)
gemstone
Ruby (Faceted)
Corundum (Al2O3:Cr)
gemstone
Mixed rock and mineral specimens
Multiple unidentified silicate rocks and minerals; likely quartz-bearing material, feldspar, mica, and iron-oxide-bearing stones
mineral
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Mixed rock and mineral specimen collection
Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens
igneous, sedimentary, metamorphic, mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Mineral (Tectosilicate)
Dyed Purple Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary