Granite Pebble
Intrusive Igneous Rock
igneous
Category
Synthetic Or Natural Fiber
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Granite Pebble
Intrusive Igneous Rock
igneous
Diamond (Rough)
Diamond (Carbon, C)
Mineral
Rounded gray pebble, likely quartz-rich stone
Indeterminate; possibly quartzite or a weathered granitic pebble
rock
Tiger's Eye
Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)
Mineral
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Diamond
Diamond (pure carbon; C)
Mineral
Quartz (Yellow/Citrine Variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Golden Quartz / Citrine / Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Weathered, iron-stained boulder (rock type uncertain)
Unidentified weathered rock; the image does not show enough detail to determine its lithology
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Chalcedony (River Pebble)
Silicon Dioxide (SiO2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Basalt River Stone
Basalt (extrusive igneous rock)
igneous
White Agate / Chalcedony
Silicon Dioxide (SiO2)
gemstone
Quartz pebble
Silicon dioxide (SiO2)
mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Porphyry
Porphyritic Andesite / Basaltic Porphyry
igneous
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Jasper pebble
Silicon Dioxide (SiO2 with iron oxide inclusions)
sedimentary
Granite Pebble (Pink Feldspar-rich)
Granite
igneous
Basalt (Vesicular)
Vesicular Basalt
igneous
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Unidentified gray metallic object
Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material
mineral
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Tumbled golden-brown stone, likely sandstone or iron-stained quartzite
Indeterminate from image; probable quartz-rich sandstone (SiO₂) or quartzite
sedimentary or metamorphic