Mixed (Sedimentary, Igneous, And Metamorphic)

Botryoidal hematite (specular/earthy hematite)

Hematite, Fe₂O₃

Pyrite

Iron Sulfide (FeS2)

Beach cobbles, predominantly basalt with vesicular volcanic fragments

Basalt (mafic volcanic rock), with possible altered basalt and minor feldspar/quartz-bearing pebbles

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Rounded conglomeratic river pebble

Polymict conglomerate (lithified gravel), composition uncertain from image

Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Graywacke sandstone (probable)

Lithic graywacke; composition commonly quartz, feldspar, lithic fragments, and clay-rich matrix

Tumbled jasper or chert pebble

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Feldspar (Plagioclase / Potassium Feldspar)

Feldspar Group (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Graywacke (River Cobble)

Graywacke (Lithic Sandstone)

Yellow Chert (Chert / Jasper)

Silicon Dioxide (SiO2 / Microcrystalline Quartz)

Weathered polymictic gravel/conglomeratic rock

Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments

Mixed gravel and mineral fragments

Polymictic unconsolidated sediment; likely quartz, feldspar, chert, mica, and lithic fragments

Rounded sandstone cobble

Quartz-rich sandstone, likely arkosic or lithic sandstone

Biotite granite (likely weathered granite)

Granite; quartz + feldspar + biotite, with accessory dark minerals

Pyrite Cube in Matrix

Iron Sulfide (FeS2)

Weathered conglomeratic breccia

Polymictic conglomerate/breccia, likely iron-stained

Rounded gray stone, likely weathered chert or quartz-rich river pebble

Chert (microcrystalline SiO₂), tentative

Pink Granite

Phaneritic Plutonic Felsic Rock (K-feldspar rich)

Quartz pebble

Silicon dioxide (SiO2)

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Yellow Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Tumbled quartz-rich stone, possibly granite or rhyolite

Likely quartz (SiO₂) with feldspar and minor mica or other inclusions

Crushed granite aggregate

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Tumbled granite or granitic gneiss pebble

Granite/granitic gneiss, chiefly quartz, feldspar, and dark biotite or amphibole

Granite

Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende

Likely gray granite fragment

Granite, composed mainly of quartz, feldspar, and mica

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Mixed landscaping gravel and rounded fieldstones

Lithologically mixed aggregate; likely quartzite, basalt, granite, and weathered sedimentary rocks

Polished labradorite-bearing rock

Labradorite, a calcium-rich plagioclase feldspar; likely mixed with quartz and mafic minerals

Petrified Wood and Mixed Rocks

Silicified Wood (SiO2)

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)

Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)

Pink Granite

Granite (Felsic Plutonic Igneous Rock)

Polished pink-and-gray stone, possibly granite or rhyolite

Probable felsic igneous rock; likely quartz–feldspar–mica aggregate, but exact identification is uncertain from the image

Yellow Quartz (Citrine Quartz / Milky Quartz)

Silicon Dioxide (SiO2)

Tumbled yellow-brown jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Tumbled jasper or chalcedony pebble

Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining