This science project is describing rocks and landforms.
Basalt is dark colored and fine grained.
Granite is light colored with large grains the eyes are visually able to see.
Obsidian can be colorful but it's usually a dark color like black, it's smooth and has sharp edges at first.
Pumice is light colored and is extremely porous.
Rhyolite most are light gray to pinkish in color, but red or even black rhyolites are not rare.
Marble is a non-foliated, its composed of recrystallized carbonate minerals, most commonly calcite or dolomite.
Slate is minerals not visible with the naked eye or with a hand lens, rock shows slaty cleavage, its usually dark-colored.
Quartzite rock has inter grown quartz grains, this is massive and hard, its gray but appears colorless when broken up.
Gneiss rock is coarse grained and usually banded with alternating layers of light and dark minerals.
Schist rock is medium to coarse grained with visible grains of mica or other metamorphic minerals, its often shiny due to reflection of mica on foliation planes.
Chert is usually gray, white, or black it can be craved and its sharp.
Limestone is often formed from shells and bones, it is a light color like white, tan, or gray.
Halite when pure, is colorless, but the impurities present often color it red, gray, yellow, purple, or blue. The streak is colorless or white, its rough feeling and has crystal forms.
Coal is made largely of carbon but also features other elements such as hydrogen, oxygen, sulfur, and nitrogen. Its very dark colored.
Sandstone is composed of sand-sized grains of mineral, its colorful and kinda smooth.