Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite
Quartzite (mostly SiO2)
metamorphic
Ironstone Concretion / Hematite Nodules
Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))
sedimentary
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Basalt with Peridotite Inclusion
Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith
igneous
Scoria (Red Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Likely iron-rich rock or metallic mineral fragment
Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment
mineral
Garnet Rhyolite
Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet
igneous
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)
Igneous
Red Jasper
Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Raw Corundum (Sapphire/Ruby variant)
Aluminum oxide (Al2O3)
mineral
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled epidote or epidote-rich stone
Epidote, Ca₂(Al,Fe)₃(SiO₄)₃(OH); possibly a green jasper or prehnite-epidote aggregate
mineral
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Chert (varietal Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Industrial Diamond (Bort or Boart)
Diamond (pure Carbon, C)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Coal (most likely Bituminous or Anthracite)
Coal (primarily composed of carbon with varying amounts of other elements)
Sedimentary rock
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Red Quartzite Pebble
Meta-quartzite (SiO2 with Hematite inclusions)
metamorphic