Chistolite slate is a variation of slate which also contains chiastolite crystals within it,the slate its self is either a brick red or plum colour with the chiastolite crystals appearing as white lines and randomly orientated within the rock matrix. rock specimens are available in various sizes and will be supplied in a labelled card tray.
Chiastolite slate is rock formed by contact metamorphism of carbonaceous shale, characterized by prominent cleavage or schistosity and the presence of conspicuous chiastolite crystals in a fine-grained matrix, the rock, unlike the classic slate is actually quite soft and friable. Chiastolite is a variant of the mineral andalusite and is present in these samples as numerous thin, white lines with random orientation, with their presence indicating peak temperatures. These particular specimens come from Cumbria, UK and are available in various sizes to choose from and will be supplied in a card tray with an information label.