Igneous, Sedimentary, And Metamorphic Mix

Diorite (Salt and Pepper Rock)

Diorite

Conglomerate

Sedimentary Conglomerate

Eclogite (retrograded)

Eclogite (Omphacite-Garnet rock)

Pink Marble (Quartzite or Calcite mix)

Metamorphosed Limestone / Quartzite (CaCO3 or SiO2 with iron impurities)

Polished Agate or Jasper-Agate

Silicon Dioxide (SiO2)

Jasper with Quartz (Agate/Jasper mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper Agate (Carnelian Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Gabbro or Diorite with Felsic intrusion

Mafic to intermediate intrusive igneous rock with felsic vein/inclusion

Red Sandstone / Mudstone Nodules (L Liesegang rings)

Sedimentary Rock (Quartz/Hematite Clay Mix)

Rounded granite cobble

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Quartz-rich pebble

Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment

River Rocks and Pebbles

Mixed Silica-rich Sediments (SiO2 based)

Pumice

Pumice (Vesicular intermediate to felsic volcanic glass)

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Greenstone (likely serpentinite or altered basalt)

Serpentinite-group rock, commonly dominated by antigorite/lizardite; exact identification requires testing

Unakite

Epidotized Granite

Quartz (Milky / Massive Quartz)

Silicon Dioxide (SiO2)

Granite (likely biotite granite or granodiorite)

Coarse-grained granitoid; mainly quartz (SiO₂), feldspar, and biotite/amphibole

Pink granite (likely a feldspar-rich granitoid)

Granite, composed mainly of quartz, potassium feldspar, plagioclase, and mica

Weathered granite fragment

Granite, a coarse-grained plutonic rock composed mainly of quartz, feldspar, and mica

Tumbled granite pebble

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica/amphibole

Rounded granite pebble

Granite, predominantly quartz, feldspar, and mica

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Dragon Blood Jasper

Epidote with Red Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Unakite

Altered Granite (Epidotized Granite)

Soapstone (Steatite) and Quartz mix

Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)

Diorite

Intermediate Phaneritic Igneous Rock

Granite Pebble

Granite (Plutonic Igneous Rock)

Biotite-bearing granite

Granite, composed chiefly of quartz, feldspar, and dark biotite or amphibole

Likely weathered granite pebble

Granite, a quartz–feldspar-rich intrusive igneous rock

Limestone Pebble

Sedimentary Rock (Calcite, CaCO3)

Sandstone (Greywacke/Lithic Sandstone)

Clastic Sedimentary Rock (Lithic Sandstone)

Siltstone Pebble

Siltstone (composed of hydraulic-sorted silt-sized particles)

Basalt Pebble

Basalt

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Polished Kambaba jasper (orbicular jasper)

Orbicular microcrystalline quartz, commonly sold as Kambaba jasper; typically quartz/chalcedony with dark green to black amphibole or other inclusions

Caribbean Calcite

Calcium Carbonate (CaCO3) with Aragonite (CaCO3)

Greenstone pebble (identification uncertain from photo)

Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote