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Gray to brown mudstone with abundant silt.

Dark gray, with hornblende as the dominant mafic mineral.

Typical green-gray, fissile, clay-rich.

Himalayan mineral great for teaching and display.

Well-cemented, medium-grained orthoquartzite.

Examine Oceanic Water Patterns That Cause the Gulf Stream and El Niño.

Look for the V at the neck.™ Economical, disposable tools for transferring, collecting, and handling chemical and biological materials.

Light gray, fine-grained, well-foliated, schistose.

Gray-to-brown basaltic, with over 50% vesicles.

Is the victim a male or female?

The Student Double-Wall Calorimeter is an inexpensive necessity for your experiments.

Massive, chlorite-rich.

Brownish black, intermediate stage between peat and bituminous coal.

Deep blue, massive, with nepheline; key feldspathoid.

Red, classic oolitic texture.

Collection of popular Algae samples.