Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
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Tumbled serpentine (likely bowenite/antigorite)
Serpentine-group minerals, chiefly antigorite or lizardite; commonly Mg₃Si₂O₅(OH)₄
metamorphic
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Likely garnet-bearing rock fragment
Garnet-bearing schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
metamorphic
Quartzite
Silica (SiO2) quartzite
metamorphic
Tumbled dark-green serpentine
Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)
metamorphic
Milky Quartz with Nephrite Jade
Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2
mineral/metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz (Milky or Chalcedony)
Silicon Dioxide (SiO2)
mineral
Polished jasper carving or slab
Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron-oxide-rich brecciated or orbicular jasper
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite
igneous
Tumbled brown-black stone, likely smoky quartz or iron-stained agate
Indeterminate from image; possible quartz (SiO₂), chalcedony, or iron-rich jasper
mineral
Milky Quartz Pebble with Matrix
Quartz (SiO2)
mineral
Tumbled serpentinized ultramafic rock
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with probable quartz/calcite veins and iron oxides
metamorphic
Green Jasper with Quartz veins
Jasper (Silicon Dioxide, SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Tumbled greenstone (likely serpentine or nephrite-like material)
Serpentinite, chiefly serpentine-group minerals; exact identification requires testing
metamorphic
Garnet (likely Almandine or Pyrope)
Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Sunstone Beads
Feldspar group (Oligoclase / Labradorite)
gemstone
Green Jasper Pebble
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Milky Quartz with Mica inclusions
Silicon Dioxide (SiO2) with Muscovite/Biotite
mineral
Sandstone
Arenite
sedimentary
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
sedimentary
Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Sunstone
Feldspar group (Oligoclase / Labradorite)
gemstone
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Sandstone
Arenite
sedimentary
Serpentine (likely polished serpentine pebble)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral