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Diameter, mm (1mm - 0,039inch)
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  3. Aenigmatite

Aenigmatite mineral - You can buy these samples

Aenigmatite is a relatively rare mineral, a ribbon silicate. The name comes from the Greek "enigma" - a riddle. Forms prismatic crystals, usually irregular in shape. It is also found in grains and their aggregates.

You can see Aenigmatite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Aenigmatite

General
Category Inosilicates
Formula
(repeating unit)		 Na2Fe2+5TiSi6O20
IMA symbol Aen
Strunz classification 9.DH.40
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group P1
Unit cell a = 10.415(1), b = 10.840(1)
c = 8.931(1) [Å]; Z = 2
α = 105.107(4)°
β = 96.610(5)°
γ = 125.398(4)°
Identification
Color Velvet-black
Crystal habit Poorly developed prismatic crystals, occurring as irregular clusters; pseudomonoclinic
Twinning Complex by rotation perpendicular to (011) or about [010] of the pseudomonoclinic cell; polysynthetic
Cleavage Good on {010} and {100}
Fracture Uneven
Tenacity Brittle
Mohs scale hardness 5.5
Luster Vitreous to greasy
Streak Reddish brown
Diaphaneity Translucent to opaque
Specific gravity 3.81
Optical properties Biaxial (+)
Refractive index nα = 1.780 - 1.800 nβ = 1.800 - 1.820 nγ = 1.870 - 1.900
Birefringence δ = 0.090 - 0.100
Pleochroism X = yellow brown; Y = red-brown; Z = dark brown to black
2V angle Measured: 27° to 55°
Dispersion r < v; very strong

Aenigmatite, Astrophyllite
Code: 4385
Aenigmatite, Astrophyllite
Khibiny, Kola Peninsula, RF
49*35*16mm

0.00 $ $19.67

Aenigmatite, Astrophyllite
Code: 1205
Aenigmatite, Astrophyllite
Khibiny, Kola Peninsula, RF
49*45*21mm

0.00 $ $25.00

Aenigmatite, Astrophyllite archived
Code: 1203
Aenigmatite, Astrophyllite
Khibiny, Kola Peninsula, RF
61*47*11mm

0.00 $ $60.00

Aenigmatite, Astrophyllite archived
Code: 1204
Aenigmatite, Astrophyllite
Khibiny, Kola Peninsula, RF
57*47*14mm

0.00 $ $30.00

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