Mineral Information and Data:

Margarosanite
Ca2PbSi3O9 [CNMNC approved formula]

Named from the Greek for "pearl" and "tablet", in reference to its luster and lamellar habit.

IMA status : Valid species (Pre-IMA 1916) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
59.01.02.02  
  (59) Cyclosilicate Three-Membered Rings
  (59.01) anhydrous, no other anions
  (59.01.02) Walstromite group
  
Nickel-Strunz
(10th edition) :
09.CA.25
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CA) [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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