Mineral, Specifically A Detrital Grain

Chert Pebble (Yellow/Brown Jasper variety)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Black Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Granite Pebble

Granite (a phaneritic intrusive igneous rock consisting of quartz, alkali feldspar, and plagioclase)

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone (likely Greywacke variant)

Arenite

Diorite

Phaneritic intermediate plutonic rock

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

Sandstone

Arenite (SiO2 based)

Red Jasper (Banded Jasper)

Jasper (Silicon Dioxide, SiO2)

Jasper

Silicon dioxide (SiO2)

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Riverstone (Water-worn Quartzite)

Quartzite (SiO2)

Coarse-grained Granite

Phaneritic Granite (contains Quartz, Feldspar, and Mica)

Sandstone

Arenite (SiO2 based with various mineral cements)

Pink Granite (River Pebble)

Phaneritic Felsic Igneous Rock

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (and associated Flint)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Lignite (Brown Coal)

Humic Lignite (Carbonaceous sedimentary rock)

Schist

Mica Schist

Gneiss (specifically Banded Gneiss)

Gneiss

Granite or Pegmatite with Mica

Granitoid

Chert (specifically Jasper/Carnelian Agate)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Chert (specifically Jasper or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Sandstone

Arenite (SiO2 with Fe2O3)

Mica Schist

Mica Schist

Chert (specifically Flint or Common Chert)

Chert (Cryptocrystalline Silica, SiO2)

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)

Ferruginous Sandstone (Red Sandstone)

Arenite with Hematite/Limonite cement

Jasper (specifically Yellow/Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Sandstone (mainly SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone (Ferruginous)

Arenite (Fe-rich SiO2)