Man Made Glass (Often Grouped With Minerals In Lapidary)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Obsidian

Volcanic Glass (predominantly SiO2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Quartz

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Greenstone Porphyry

Altered Porphyritic Andesite/Basalt

Quartzite River Rock with Dendrites

Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Red Jasper (Brecciated Jasper)

SiO2 (Silicon Dioxide) with Ferric Iron inclusions

Quartz

Quartz (SiO₂)

Milky Quartz with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Rhodonite (in matrix)

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Milky Quartz

Quartz (SiO2)

Chert Nodules

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Biotite Mica

K(Mg,Fe)3AlSi3O10(OH)2

Quartz (likely Chalcedony or Chert)

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Rose Quartz

Silicon Dioxide (SiO2)

Black Obsidian

Volcanic Glass (predominantly SiO2)

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Rhodonite

Rhodonite (Mn2+SiO3)

Epidote in Matrix (Dragon Stone variant)

Epidote with Quartz/Feldspar (Ca2(Al,Fe)3(SiO4)3(OH))

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

Geode (Unopened)

Siliceous Concretion / Geode

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Chert (Jasper variation)

Silicon dioxide (SiO2)

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)