"The Mystery of Lyle and Louise"

Slaty cleavage; contains hematite.

Pale pink felsite, with small sanidine phenocrysts.

Spinel group; black, dull metallic luster; common iron oxide.

Gray to buff, with numerous ooliths and fossil fragments.

Gray, fine-grained, massive contact rock.

Used to investigate wavelength in air.

Play sand provides tactile and sensory stimulation necessary for the development of a child's imagination, hand-eye coordination, and fine motor skills such as shoulder stability, forearm rotation, wrist control, and hand strength. Play sand also encourages creativity, visualization and social interaction.

Measure grip strength, pinch strength, and muscle fatigue wirelessly with Go Direct® Hand dynamometer.

Lustrous, black 'hard coal'.

Light gray, fine small clasts.

Dense and massive.

Hematite-cemented quartz; orthoquartzite.

Pure, large, transparent-to-translucent cleavages, Mohs’ hardness of 4.

Chlorite-bearing.

Vector of yellow fever. Unstained.

Soft non-woven outer facing wicks moisture into a cellulose core, which quickly absorbs and disperses fluid.