Mineral, Part Of A Rock

Tumbled brown-and-black stone, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase, pyroxene, and possibly olivine or iron oxides

Weathered quartz-rich pebble

Likely quartzite or quartz-rich granite fragment; exact identification is uncertain from the blurred image

Red Scoria (Lava Rock)

Scoria (highly vesicular basaltic/andesitic rock)

Emerald

Beryl (Be3Al2(SiO3)6)

Tumbled tan stone, possibly sandstone or weathered limestone

Indeterminate; likely quartz-rich sandstone or calcitic limestone

Quartz with Chalcopyrite (or Pyrite)

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Basalt

Basalt

Tektite (Indochinite)

Tektite (Terrestrial Impact Glass)

Fossil shark tooth, likely megalodon

Fossilized shark tooth; possibly Otodus megalodon (formerly Carcharocles megalodon)

Quartz Druzy

Crystalline Silicon Dioxide (SiO2)

Fossil sea urchin test

Echinoid test (class Echinoidea), likely a fossilized regular sea urchin

Rounded quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂)

Rounded quartzite pebble

Quartzite, composed predominantly of recrystallized quartz (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble (with Iron Staining)

Quartzite (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Limestone Pebble

Limestone (Calcium Carbonate, CaCO3)

Rounded river pebble, likely quartz-rich chert or fine-grained sandstone

Indeterminate lithic clast; possible microcrystalline quartz (chert) or quartz-rich sandstone

Chalk (Calcitic)

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Granite

Granitoid (comprised of Quartz, Feldspar, and Mica)

Rounded granite cobble

Granite; primarily quartz, feldspar, and biotite/hornblende

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Rugose Coral (Horn Coral) Fossil

Order Rugosa (likely Grewingkia or Zaphrentis genus)

Jasper

Jasper (SiO2 plus impurities)

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

Amber

Succinite (Resinite), C10-H16-O

Weathered quartz-rich pebble

Likely quartzite or quartz-bearing sandstone; identification is uncertain from the photograph alone

Granite

Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Rounded river pebble, likely basalt or fine-grained volcanic rock

Probable basalt (plagioclase–pyroxene ± olivine), though exact identification requires testing

Rounded basalt cobble

Basalt; fine-grained mafic volcanic rock, commonly containing plagioclase, pyroxene, and olivine

Goethite (likely as part of Limonite/Ironstone)

Goethite (α-FeOOH)

Rounded gray pebble, likely quartz-rich river cobble

Probable granitic or quartzitic cobble; exact identification requires a fresh surface and tests

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Jadeite Jade

Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)

Orange Quartz (likely Carnelian or stained Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Botryoidal Chalcedony Geode

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Tektite (Indochinite)

Tektite (Natural silica glass)