Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
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Concretion
Sedimentary Concretion
sedimentary
Granite
Intrusive Igneous Rock
igneous
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Basalt with Amygdales
Amygdaloidal Basalt
igneous
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite or Porphyritic Igneous Rock (weathered)
Granitoid
Igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Jasper with Purple Fluorite or Chalcedony
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Quartz pebble with calcite
Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)
sedimentary
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Quartz-veined Basalt or Diabase Pebble
Igneous rock with hydrothermal quartz vein
igneous
Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Shale
Shale (claystone/mudstone)
sedimentary
Shale
Laminated Fissile Pelite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Granite
Plutonic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Hag Stone (Adder Stone / Geode-bearing Pebble)
Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)
sedimentary
Copper Ore (Malachite and Limonite bearing rock)
Copper-bearing rock with secondary copper minerals
mineral
Granite
Intrusive Igneous Rock
igneous