$5.50 inc GST

This diatomite was formed in a fresh water lake and is overlayed by a Tertiary basalt flow. Made up of diatoms of the Melosira species, it is microscopically porous, has a low bulk density and has many uses in agriculture from food additive to soil ameliorant and as a soluble form of pure silica which helps plants resist both fungal and insect attack.

Diatoms are about 10um in size and visible with a good light microscope.

Images are examples of specimens only.

Size and shape may vary.

Specimens are usually no smaller than 75mm in one dimension.

20 in stock