If a particular mineral is found to occur time after time in the form of, say, a radiating cluster of needle-like crystals, we say that this is the habit of this particular mineral. If another mineral typically occurs as a kidney-shaped mass, this is the habit of that particular mineral. Thus we have mineral habit, an extremely important aid in the identification of many minerals, especially when the crystal system of a specimen found in the field cannot be determined by inspection.
…can be distinguished from variscite only on the basis of blowpipe tests; chrysocolla is softer.
Chrysocolla usually sticks to the tongue, and this is perhaps its best known distinguishing characteristic.