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though they show cubic cleavage
it does not expand when it comes in contact with water and is the preferred type of clay for the ceramics industry
In some years none are found at all
a black mechanical pencil (it has an eraser)
For the pink fluorescence
galena - teaching student specimens of the primary ore of lead with attached matrix - Talsint (?) Morocco - Unit of 5 specimens though they show cubic cleavageGalena PbS Galena is a very common metallic sulfide. It often occurs in cubic crystals and has good cubic cleavage. It is practically the only source of lead, which is used in huge amounts in storage batteries and in shielding from radioactivity. Galena is the Latin name for lead ore. Galena is easily identified by students by its density, metallic luster and its cubic cleavage. Not cleaved into rectangular blocks, though they show cubic cleavage,
