Gravel does not alter water parameters. The black colour of gravel becomes intense in contact with water. Ideal for all habitats, great for Malawi and Tanganyika.
Rinse before use.
Beautiful and natural used by professionals .
How much gravel do you need?
Aquarium 63 liters (60 x 30cm) -8 to 10 kg
Aquarium 112 liter (80 x 35cm) - 12 to 16 kg
Aquarium 200 liter (100 x 40cm) - 20 to 24 kg
Aquarium 240 liter (120 x 40cm) - 25 to 29 kg
Aquarium 300 liter (120 x 50cm) - 30 to 37 kg
Aquarium 375 liter (150 x 50cm) - 40 to 49 kg
Aquarium 500 liter (200 x 50cm) - 52 to 60 kg
Basalt is a very common dark-colored volcanic rock composed of calcic plagioclase (usually labradorite), clinopyroxene (augite) and iron ore (titaniferous magnetite). Basalt may also contain olivine, quartz, hornblende, nepheline, orthopyroxene, etc. Basalt is a volcanic equivalent of gabbro.
Basalt is usually black or dark gray and relatively featureless. It is composed of mineral grains which are mostly indistinguishable to the naked eye. Basalt may also contain volcanic glass. Basalt may contain phenocrysts (larger crystals within fine-grained groundmass) and vesicules (holes that were filled by volcanic gases).
Black color is given to basalt by pyroxene and magnetite. Both of them contain iron and this is the reason why they are black. So this is iron again which is responsible for the coloration of basalt. Plagioclase, volumetrically usually the most important constituent, is mostly pale gray in color.
Basalt is a major rock type that occurs in virtually every tectonic setting. Basalt is clearly the most common volcanic rock on Earth and basaltic rocks (including gabbro,diabase and their metamorphosed equivalents) are the most common rocks in the crust