Milky Quartz Pebble with Matrix
Quartz (SiO2)
mineral
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Goniatite Fossil
Order Goniatitida
fossil
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Amethyst (or Light Amethyst / Rose Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Chert (Brecciated or Veined)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Serpentine
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Quartz
Silicon dioxide (SiO₂)
Mineral
Quartz Mix and Feldspar Group
Silicon Dioxide (SiO2) and Potassium Alumino-silicates (KAlSi3O8)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Microcline (Potassium Feldspar)
Microcline (KAlSi3O8)
mineral
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Black Tourmaline (Schorl) on Quartz
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Green Jasper Pebble
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Obsidian
Volcanic glass
igneous
Almandine Garnet (weathered)
Almandine (Fe3Al2(SiO4)3)
mineral
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Pink feldspar fragment (probable orthoclase or microcline)
Potassium feldspar, KAlSi₃O₈
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Jasper pebble)
Silicon dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Milky Quartz with Mica inclusions
Silicon Dioxide (SiO2) with Muscovite/Biotite
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Granite
Granite (a plutonic rock)
Igneous
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary