Mineral Side Rock

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Quartz Pebble (Iron-Stained)

Crystalline Silicon Dioxide (SiO2)

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Shale

Mudstone/Shale

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Chrysocolla (on host rock)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz / River Cobble

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Gneiss

Gneiss (High-grade metamorphic rock)

Basalt (with possible Calcite/Quartz veining)

Afanitic Mafic Igneous Rock

Schist

Mica Schist

Lake Superior Agate

Silicon Dioxide (SiO2)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Rough Dark Green Sapphire

Corundum (Al2O3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Banded Agate (Gray/Brown)

Silicon Dioxide (SiO2)

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Sandstone (with Chert/Quartzite)

Arenite (SiO2 primarily)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Sandstone

Arenite (primarily Quartz Arenite)

Concretion

Siderite or Ironstone Concretion

Concretion (Sandstone)

Sandstone Concretion