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Aenigmatite

• 
  Eveslogchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
  © Sergey Vasiliev

• Formula:
  Na₂Fe²⁺₅Ti(Si₆O₁₈)O₂

• System: Triclinic

• Name:
  From the Greek αίνιγμα ("aenigma"), "a riddle", alluding to the uncertain chemical composition of the mineral.

• IMA Status: Valid (Approved)

• Type Locality:
  Kangerdluarssuq (Kangerdluarssuk; Kangerdluarsuk) Firth, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland

• Dana 8th: 69.2.1a.1
  
  69 : INOSILICATES Chains with Side Branches or Loops
  2 : Chains with Side Branches or Loops with P>2

• Strunz 9th:
  9.DH.40
  
  9 : SILICATES (Germanates)
  D : Inosilicates
  H : Inosilicates with 4-periodic single chains

• Hardness (Mohs): 5½ - 6

• Lustre: Greasy

• Diapheny: Translucent,Opaque

• Diapheny: brittle

• Colour: Velvet-black

• Streak: Reddish brown