Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Category
Organic (Often Found By Beachcombers)
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
SiO2 (Silicon Dioxide)
metamorphic
Basalt
Basalt (aphanitic mafic volcanic rock)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
French Bulldog (Blue Variety)
Canis lupus familiaris
Organic (Biological Organism)
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Purple Lepidolite with Quartz
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Crinoidean Fossil (Stem Fragment)
Phylum Echinodermata, Class Crinoidea
fossil
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Man-made)
mineraloid
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartzite
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Black Sand (Magnetite/Heavy Mineral Concentrate)
Magnetite-rich Placers (Fe3O4)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium fluoride, CaF2
Mineral
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Botryoidal Hematite (Kidney Ore)
Hematite (Fe2O3)
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Venetian Gold Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous