Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
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Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Limestone
Limestone (primarily composed of Calcium Carbonate, CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Diamond (C)
mineral
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Purple fluorite (likely cubic crystal aggregate)
Fluorite, calcium fluoride (CaF₂)
mineral
Tumbled green aventurine (probable)
Quartz aggregate, SiO₂, commonly containing fuchsite mica inclusions
mineral
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Quartz geode or drusy quartz cluster
Quartz (silicon dioxide, SiO₂), likely microcrystalline quartz lining a cavity
mineral
Blue-green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; commonly classified as orbicular jasper
mineral
Tumbled yellow chalcedony (likely citrine or yellow quartz)
Quartz, SiO₂; potentially microcrystalline chalcedony
mineral
Mica Schist
Mica Schist (predominantly Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Chert
Microcrystalline silica (SiO2)
sedimentary
Rough Diamond
Diamond (Native Carbon), C
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Diamond
Carbon (C)
gemstone
Orange chromium diopside (likely tumbled)
Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion
mineral
Chert (varieties: Flint or Chalcedony)
Microcrystalline silica (SiO2)
sedimentary
Blue sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Schist (Greenschist / Mica Schist)
Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)
metamorphic
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Olivine (Peridot in gem form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon)
metamorphic
Diamond
Carbon (C)
gemstone
Green fluorite (likely polished/cut specimen)
Fluorite, calcium fluoride (CaF₂)
mineral