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The rounded, differently sized stones make your tank look like a stream bed.

Attractive Bottom Cover Enhances Natural Filtration and Nitrogen Cycling
Gravel contains no lead or chrome and won’t change the pH or chemistry of the tank. Pebble sizes up to 1/4" dia.

Fast and easy-to-use, this kit contains two dropper bottles for accurate dispensing of test solutions, non-staining test tube with snap cap, and instructions. It comes with enough solution for 130 tests and can be used in either fresh or salt water. Range: 0–8 ppm ammonia.

Observe and compare gem minerals

Students discover the variety of rocks and minerals with this collection.

Add the Color of Fluorescence to Your Studies

The Advanced Earth Science Collection features a large, detailed collection of specimens to provide a better understanding of earth’s composition.

This collection with rock types and associations with the North American continent contains 100 specimens with each group represented: igneous, metamorphic, and sedimentary. Specimens are approximately 1"" x 1"", number-coded in compartmented container.

Brilliant, colorful display of short and long wave fluorescent minerals will seize your students’ attention. Set contains six specimens, each 1" x 1" average size, stored in a partitioned box with key sheet.

Demonstrate the vivid contrasting colors of fifteen specimens when illuminated under shortwave ultraviolet light. Some specimens are also long wave reactive. Specimen average size: 1" x 1". Comes in compartmented box with key sheet.

Clear, euhedral points and sections.

Deep purple crystal clusters.

Fine crystalline, pure calcite.

Classic, very coarse-grained igneous texture.

Hematite-cemented quartz; orthoquartzite.

Chlorite-bearing.

Gray to brown mudstone with abundant silt.