Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Tumbled quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂)
metamorphic
Iron-Stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)
mineral
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Diamond
Natural Diamond (Carbon, C)
mineral
Diamond (in jewelry setting)
Cubic Carbon (C)
mineral
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Desert Rose
Baryte (BaSO4) or Gypsum (CaSO4·2H2O) with sand inclusions
mineral
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Slate
Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)
metamorphic
Rounded quartz-rich pebble
Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Basalt (River Cobble)
Mafic Igneous Rock (Basalt)
igneous
Ventifact
Eolian Ventifact (often composed of basalt, chert, or quartzite)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Citrine
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Ametrine
Quartz (Silicon Dioxide, SiO2)
gemstone
Likely basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Polished white agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion
gemstone
Diamond
Diamond (C)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
igneous
Lepidodendron Fossil (Scale Tree)
Lepidodendron
fossil
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Citrine Quartz (Raw)
Silicon Dioxide (SiO2)
mineral
Gabbroic rock, possibly hornblende gabbro
Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Rounded gray pebble, likely quartz-rich river stone
Probably quartzite or quartz-rich sandstone; exact identification requires testing
sedimentary
Quartz (Milky Quartz / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary