Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral Pseudomorph
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Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Bumblebee Jasper
Anhydrite-Aragonite mixture with Orpiment and Realgar
mineraloid
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Gneiss (Metamorphic Cobble)
Gneiss
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Unakite
Epidotized Granite
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (small fragment)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Greenschist / Migmatite
Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)
metamorphic
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Amphibolite
Amphibolite
metamorphic
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Okenite
Okenite, Ca3Si6O15·6H2O
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Schist
Mica Schist
metamorphic
Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
mineral/hydrothermal
Schist
Mica Schist
metamorphic
Peacock Ore
Bornite (Cu5FeS4) with surface tarnish
mineral
Sandstone (Iron-stained)
Quartz Arenite with Iron Oxide Stain (SiO2 + Fe2O3)
sedimentary
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary