Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Chrysocolla in Quartz (Quantum Quattro variant)

Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) often mixed with SiO2

Turquoise

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

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Agate

Silicon Dioxide (SiO2)

Turquoise (possible Dyed Howlite or Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Turquoise)

Native Copper (Penny specimen)

Native Copper (Cu)

Jasper Agate

Chalcedony (Silicon Dioxide - SiO2)

Beach Agate (Chalcedony)

Silicon Dioxide (SiO2)

Turquoise

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

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Turquoise

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

Limonite (Iron Ore)

Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)

Dyed Blue Agate

Silicon Dioxide (SiO2)

Botryoidal Hematite

Hematite (Iron(III) oxide, Fe2O3)

Turquoise in Matrix

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

Limonite (Iron Ore)

Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Iron-Stained Quartz Pebble

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions

Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Milky Quartz with Chlorite inclusion

Silicon Dioxide (SiO2) with Chlorite group inclusions

Agate

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Basalt (Igneous Volcanic Rock with secondary mineral infilling)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Basalt with vesicles/amygdules

Basalt (containing volcanic glass and plagioclase)

Quartzite (Yellow/Iron-Stained)

Quartzite (SiO2 with Iron Oxide impurities)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Shiva Lingam

Cryptocrystalline Quartz (Jasperiod) with Iron Oxide (Fe2O3)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz with Oxides

Silicon Dioxide (SiO2)

Crystalline Quartz (Rough)

Quartz (Silicon Dioxide, SiO2)

Carnelian

Carnelian (SiO2 with Iron oxide impurities)

Scoria with Calcite Infills

Vesicular Basalt with secondary Calcification (CaCO3)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Amethyst (Quartz)

Silicon Dioxide with Iron impurities (SiO2)

Ferruginous Siltstone or Mudstone

Ferruginous Siltstone / Goethitic Sandstone

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Dzi Bead Necklace (Agate/Carnelian)

Chalcedony (cryptocrystalline Quartz), SiO2

Lake Superior Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Bloodstone

Heliotrope (Cryptocrystalline Quartz, SiO2)

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)