Igneous And Metamorphic Derivative (Weathered)

Limonitic Gossan

Goethite/Limonite aggregate after sulfide

Ambergris

Ambrein (C30H52O Derivative)

Asphalt Concrete

Bituminous conglomerate

Picasso Stone

Metamorphic Limestone (Marble)

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Quartz pebble

Silicon dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Quartz pebble with iron staining

Silicon dioxide (SiO2) with iron oxide inclusions

Quartz pebble

Silicon dioxide (SiO2)

Milky Quartz Pebble

Silicon dioxide (SiO2)

Quartz (Pebble)

Silicon Dioxide (SiO2)

Uncertain small stone; possibly weathered quartz-bearing rock

Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock

Quartz pebble / River stone

SiO2 (Silicon Dioxide)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Fossilized marine shell fragment

Likely a bivalve or gastropod shell preserved as calcite (CaCO₃)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Rounded quartz-rich pebble

Likely quartzite or quartz-bearing granitoid; predominantly SiO₂ quartz with possible feldspar and mica

Weathered rock fragment (likely granite or granitic gneiss)

Undetermined felsic rock; possibly quartz–feldspar granite

Banded Basalt / Lave Stone or Gneiss Pebble

Igneous/Metamorphic banded pebble

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Quartz River Rock

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich metamorphic rock, likely gneiss or quartzite

Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Small rounded mineral/rock fragment

Indeterminate; possibly quartz-rich stone or feldspar

Small tumbled pebble (likely quartz or feldspar)

Indeterminate; probable quartz (SiO₂) or feldspar

Small rounded stone or mineral fragment

Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz (SiO₂) with feldspar and minor dark minerals

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)