Acicular

Acicular is the term for the habit of crystals that naturally form in single strands.  They have a needle-like shape that tapers to a point or a blunt termination, the length of the individual crystal is much greater than the width. Acicular crystals can be clustered / growing from a central point to produce fan or radial shape.

Some examples are:

• Rutilated Quartz
• Tourmalinated Quartz
• Gypsum
• Prehnite 
  

REFERENCES:

• Geology .Com
• La Mine 2 Tout  (photo 1 credit) 
• JJ Anchors  (photo 2 credit)

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