Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Sandstone (Quartzose Pebble)

Clastic sedimentary rock (primarily SiO2)

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

Amygdaloidal Basalt

Basalt with secondary amygdule minerals (likely Epidote or Chlorite)

Tree Agate

Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony

Chert (Iron-stained)

Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)

Chert (Iron-stained)

Chert (Silicon Dioxide, SiO2)

Yellow Chalcedony (likely carnelian or yellow agate)

Silicon Dioxide (SiO₂)

Fulgurite

Fulgurite (Lechatelierite-rich variety)

Malachite

Copper Carbonate Hydroxide (Cu2CO3(OH)2)

Purple Lepidolite with Quartz

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

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Ocean Jasper

Silicon dioxide with impurities (SiO2 + impurities)

Riverstone Jasper (Chert variant)

Silicon Dioxide (SiO2)

Jasper (var. Ocean or Polychrome Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions

Red Moss Agate (Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Basalt with vesicles (Amygdaloidal Basalt)

Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Fancy Jasper

Silicon Dioxide (SiO2) with impurities

Blue Calcite

Calcium Carbonate (CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Pyrite

Iron Sulfide (FeS2)

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Quartz (Drusy/Crystalline variety)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Pyrite

Iron Disulfide (FeS2)

Quartz Geode (Water-worn)

Silicon Dioxide (SiO2)

Cobaltoan Calcite / Pink Dolomite (Possible)

Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Lepidolite

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

Banded Agate (Lace Agate)

Agate (Variety of Cryptocrystalline Quartz), SiO2

Turquoise

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

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Pyrite

Iron Sulfide (FeS2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)