Likely weathered gray-green stone, possibly serpentinite
Serpentinite (predominantly serpentine-group minerals; identification uncertain from image)
metamorphic
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, chrysotile, or antigorite; Mg3Si2O5(OH)4)
metamorphic
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Pumice or Tufa/Travertine
Pumice (if igneous) or Calcareous Tufa (if sedimentary)
igneous/sedimentary
Serpentinite
Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Blue Quartzite
Metamorphic Rock (rich in Quartz, SiO2 with inclusions of Dumortierite or Magnesio-riebeckite)
metamorphic
Tumbled green aventurine
Quartzite dominated by quartz (SiO₂), with green mica/fuchsite inclusions
mineral
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Tumbled quartz pebble (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Jasper or Agate pendant
Silicon dioxide (SiO2)
Mineral
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
mineral
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline and Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Banded Chert (or River Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Diamond
C (Carbon)
gemstone
Jasper (specifically Red Jasper)
Silicon Dioxide with Iron Oxides (SiO2 + Fe2O3)
sedimentary
Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Greenstone Pebble
Metabasalt / Greenstone
metamorphic
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Chert Nodule in Limestone
Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Greenstone / Basalt
Aphanitic Mafic Igneous Rock (Metabasalt)
igneous
Yellow Quartz
Silicon Dioxide (SiO2)
mineral