Chert (specifically Gray/Blue Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
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Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Schist
Mica Schist
metamorphic
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Granodiorite
Granodiorite
igneous
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Chert Nodule / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Covellite
Covellite (CuS)
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Basalt with Phenocrysts
Extrusive Igneous Rock
igneous
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Chert with Weathered Rind (Flint/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Biotite (Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Polished white agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion
gemstone
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Heliotrope (Bloodstone)
Chalcedony quartz variety (SiO2) with hematite or jasper inclusions
mineral
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Himalayan Salt
Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.
Mineral
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous
Gravel / Limestone Fragment
Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock
sedimentary
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Dark Chert or Flint)
Silicon dioxide (SiO2)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically White Chert or Flint)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (variously known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary