Rocks!

Basalt

Extrusive igneous, gas bubble

Breccia

Clastic sedimentary, angular pebbles

Coal

Organic sedimentary, carbon, dead plants

Conglomerate

Clastic sedimentary, round pebbles

Coquina

Bioclastic sedimentary, shell hash

Gneiss

Metamorphic foliated, pressure underground

Granite

Intrusive igneous, tiny crystals

Limestone

Bioclastic sedimentary, calcite, compressed in the ocean floor

Marble

Non-foliated metamorphic, crystals, calcite, found in mountainsides and quarries

Obsidian

Extrusive igneous, glassy black

Oolitic limestone

Sedimentary, precipitate, tiny circles

Pegmatite

Intrusive igneous, lots of big rocks, crystal clumps

Phyllite

Foliated metamorphic, regional metamorphism, pressure underground

Pumice

Extrusive igneous, OBSIDIAN WITH HOLES

Rock gypsum/Alabaster

Evaporite sedimentary, made of gypsum, crystalline formation

Rock salt

Evaporite sedimentary, made of halite, dissolves

Sandstone

Clastic sedimentary, sand clast size

Schist

Foliated metamorphic, regional metamorphism, further pressured into gneiss

Scoria

Extrusive igneous, BASALT WITH HOLES

Shale

Clastic sedimentary, splits easy, clay clast size

Siltstone

Clastic sedimentary, silt clast size

Slate

Foliated metamorphism, low grade metamorphism of shale