Mineral Specimen

Olivine in Basalt

Peridotite / Forsterite ((Mg,Fe)2SiO4)

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

Jasper in Quartz (River Cobble)

Silicon Dioxide (SiO2) with Ferric Iron inclusions

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert / Chalcedony (likely carnelian or flint variety)

Silicon Dioxide (SiO2)

Quartz Vein in Metamorphic Rock

Silicon Dioxide (SiO2) within Metasedimentary host

Quartzite Pebble

Recrystallized Quartz (SiO2)

Chert (with Limestone matrix)

Silicon dioxide (SiO2)

Tektite (Indochinite)

Tektite (Amorphous Meteoritic Glass)

Yellow Jasper

Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron impurities)

Fossiliferous Limestone (with Crinoids/Coral)

Fossiliferous Limestone (CaCO3)

Graphic Granite

Pegmatitic Granite (Quartz and Microcline KAlSi3O8)

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Red Jasper (Amygdaloidal Basalt with Agate)

Silicon dioxide (SiO2) in Basalt host

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Gold Placer (Gold Flakes and Nuggets)

Native Gold (Au)

Carnelian (a variety of Chalcedony)

Silicon dioxide (SiO2) with iron oxide impurities

Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color

Silicon Dioxide (SiO2), a variety of Chalcedony

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Iolite-bearing Gneiss (Cordierite)

Cordierite (Mg2Al4Si5O18) in Gneiss matrix

Petrified Wood

Silicified wood (Quartz variant, SiO2)

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Quartz Druzy on Basalt

Silicon Dioxide (SiO2) on Mafic Volcanic Rock

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Iron-stained Quartzite

Metamorphic Quartz (SiO2) with limonite/hematite staining

Gneiss (Granitic Gneiss)

Gneiss

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Slate

Foliated metamorphic rock

Limestone with Fossil inclusions

Fossiliferous Limestone (CaCO3)

Quartzite Pebble

Meta-quartzite

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Jasper with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)