Sedimentary Or Igneous (Host Environment)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Limonite Concretion

Goethite-rich Concretion (FeO(OH))

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Chert / Chalcedony (likely carnelian or flint variety)

Silicon Dioxide (SiO2)

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Diorite (River Pebble)

Intermediate plutonic igneous rock

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Septarian Nodule

Septarian Nodule (Mixture of Calcite, Aragonite, and Limestone/Clay)

River Pebble (Gabbro or Dark Sandstone variety)

Mafic Intrusive Rock (Plagioclase Feldspar and Pyroxene)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

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.

Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Host rock) with Quartz or Calcite amygdules

Gold Ore

Native Gold (Au) in Matrix

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Quartz-filled Basalt Geode

Amygdaloidal Basalt with Quartz (SiO2)

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Turquoise

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

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO₂)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Basalt

Mafic Igneous Pebble

Granite (River Pebble)

Phaneritic intrusive igneous rock (Felsic)

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Granite Pebble

Granite (Felsic Plutonic Rock)

Muscovite Mica (likely on Quartz/Feldspar)

Muscovite - KAl2(AlSi3O10)(OH)2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite Pebble

Granite (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: K(Mg,Fe)3AlSi3O10(OH)2)

Granite Pebble

Granite (Felsic Plutonic Rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Shale or Mudstone River Pebble

Argillaceous sedimentary rock

Jasper (Red Jasper with Quartz veins)

Jasper (Silicon Dioxide, SiO2)

Chert (Iron-stained)

Chert (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)