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The scolecite crystals range in size from microscopic to individuals 
3 millimetres in diameter, their maximum length being centimetres. 
As a rule that part of a crystal close to the walls of the vein is opaque and 
milky white; the other end is colourless and translucent. Triangular 
corrosion figures are occasionally visible on the unit pyramid. Simple 
scolecite crystals are rare. Many that appear to be a single crystal on 
closer examination are found to be a group of crystals with a (100) as 
twinning plane and attached to one another with^b(OlO) as a common 
county, Quebec. 
face. Otherwise the scolecite crystals are simple in habit. An actual 
crystal is represented in Figure 5. Several crystals were measured, but 
only the following forms could be identified: 
(According to Goldschmidt) b(010); a(100); m(110); d (101) ; o(lll). 
