Metamorphic, Likely Sedimentary With Quartz Veins

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (Metamorphic rock)

Marble

Recrystallized Calcite (CaCO3) Rock

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (likely Quartzose Sandstone)

Arenite

Yellow Chalcedony (Carnelian/Yellow Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (likely Quartz Sandstone)

Arenite (composed primarily of SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Yellow Chert (Microcrystalline Quartz)

Chert / SiO2 (Silicon Dioxide)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Limonite host rock

Milky Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide) - SiO2

Quartzite

Quartzite (chiefly SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Ironstone (likely Ferruginous Siltstone/Sandstone)

Ferruginous sedimentary rock (FeOx-rich clastic)

Yellow Quartz (Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Amethyst

SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)

Raw Citrine (Yellow Quartz)

Citrine / Silicon Dioxide (SiO2)

Gneiss

Gneiss

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Bornite

Bornite (Cu5FeS4)

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Pyrite (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Green Calcite

Calcium Carbonate (CaCO3)