Mineral Variant

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Coquina (Hag Stone variant)

Biocalcarenite (Coquina)

Limestone (Porous/Travertine variant)

Sedimentary Calcium Carbonate (CaCO3)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Tumbled Obsidian (possibly Mahogany Obsidian variant)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Obsidian (Black Obsidian)

Amorphous volcanic glass (primarily SiO2)

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Green Aventurine (Carved)

Silicon Dioxide (Quartz variant) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O(OH)2)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Banded Agate (Silk Agate or Maligano Jasper variant)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz and Rose Quartz variants)

Silicon Dioxide (SiO2)

Yellow Chalcedony (common opal or chert variant)

Silicon Dioxide (SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Botryoidal Chalcedony (Desert Rose / Grape Agate variant)

Silicon Dioxide (SiO2)

Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)

Hexagonaria percarinata (Fossilized Coral)

Rounded pebble, likely granite or granitic gneiss

Granite: quartz + feldspar + mica; the specimen may be a granitic metamorphic variant

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fancy Jasper (Ocean Jasper or River Jasper variant)

Silicon Dioxide with inclusions (SiO2)

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Chert (Hagstone/Gasket Rock variant)

Chert (SiO2)

Wood Stone (Dragon Stone variant)

Argillaceous Sedimentary Rock

Red Jasper (Heliotrope family variant)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Quartzite (Milky or Cloudy Quartz variant)

Silicon Dioxide (SiO2)

Chert (specifically Jasper or Flint variant)

Microcrystalline Quartz (SiO2)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Chert (specifically Flint or Jasper variant)

Microcrystalline silica (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

Pumice

Highly vesicular volcanic glass (unnamed scientific variant: Rhyolitic/Andesitic Pumice)

River Pebble (Gneiss or Quartzite variant)

Metamorphic rock specimen (likely Quartzite or Gneiss)

Chert (specifically Jasper or Flint variant)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)