Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Category
Mineral Or Sedimentary (If Chert)
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Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Chert Nodule in Limestone
Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)
sedimentary
Black Pebble (Basalt / Chert)
SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)
igneous
Banded gneiss (likely orthogneiss or paragneiss)
Gneiss; composition commonly quartz + feldspar + mica, with possible amphibole/biotite
metamorphic
Blue Impression Jasper beads
Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions
gemstone
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Chert (Pink and Yellow Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chert (Yellow Jasper)
Silicon dioxide (SiO2)
sedimentary
Green Chert
Silicon Dioxide (SiO2)
sedimentary
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Chert with Chalcedony/Quartz Vug
Cryptocrystalline Silica (SiO2)
sedimentary
Weathered chert or silicified limestone nodule
Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Jasper variety)
Chert (SiO2)
sedimentary
Mixed tumbled stone collection
Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite
mineral
Chert nodules in Limestone
Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Weathered chert or siliceous limestone
Microcrystalline quartz (SiO₂), possibly with carbonate minerals
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and Fossiliferous Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodules in Limestone / Fault Breccia
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary Rock
Chert (with Calcite layering)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Chert / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Honey Chert or Chalcedony Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary