Greenschist
Chlorite schist
metamorphic
Greywacke
Greywacke sandstone
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Ambergris
Ambergris (Coprolite-adjacent/Organic secretion)
mineraloid
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ambergris (Sea Wax)
Physeter macrocephalus fecalith
Organic geological/oceanic specimen
Granite Cobble
Plutonic Igneous Rock (Granitic)
igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Ambergris
Ambrein-rich Calculus
Organic (Pseudo-geological)
Vesicular Basalt
Extrusive Mafic Igneous Rock
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
igneous
Pink Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Granite
Granite (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Cryptocrystalline Quartz (Agate/Chert)
Silicon dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Dalmatian Jasper
Peralkaline rhyolite
igneous
Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Prase quartz with actinolite inclusions
Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions
mineral
Agate Geode
Silicon Dioxide (SiO2)
mineral
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Schist (Biotite Schist)
Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Slate
Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions (Fe2O3)
metamorphic
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary