Andesine Mineral Data

General Andesine Information

Chemical Formula:

(Na,Ca)(Si,Al)4O8

Composition:

Molecular Weight = 268.62 gm

Sodium 5.14 % Na 6.92 % Na₂O

Calcium 5.97 % Ca 8.35 % CaO

Aluminum 14.06 % Al 26.57 % Al₂O₃

Silicon 27.18 % Si 58.16 % SiO₂

Oxygen 47.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Ca_0.4Al_1.4Si_2.6O₈

Environment:

Magmatic and metamorphic rocks.

IMA Status:

Not Approved IMA 1841

Locality:

Andes Mountains, South America. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Andesine

Synonym:

Ab60

An40

Andesine Image

Images:

Andesine Plagioclase

Comments: Translucent andesine crystal twin.
Location: Maeyama Ueda shi, Nagano, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Andesine Crystallography

Axial Ratios:

a:b:c =0.6321:1:0.71

Cell Dimensions:

a = 8.155, b = 12.9, c = 9.16, Z = 6; alpha = 93.917°, beta = 116.3333°, gamma = 89.166° V = 861.52 Den(Calc)= 3.11

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: C1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.21(1), 3.18(0.9), 4.04(0.8),

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Forms: ( 0 0 1) ( 1 0 0) ( 1 0 1) ( 0 1 0)

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Physical Properties of Andesine

Cleavage:

{001} Perfect, {010} Good

Color:

Colorless, Gray, Yellow green, White.

Density:

2.66 - 2.68, Average = 2.67

Diaphaneity:

Transparent to Subtransparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

7 - Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Andesine

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1777,KPDmeas= 0.207,KC= 0.2067
Ncalc = 1.55 - 1.64

Optical Data:

Biaxial (+/-), a=1.543-1.554, b=1.5469-1.5587, g=1.552-1.562, bire=0.0080-0.0090, 2V(Calc)=78-84, 2V(Meas)=76-83. Dispersion none.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Andesine

Electron Density:

Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Andesine =2.67 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Andesine= 2.27 barns/electron
U=PE_Andesine x rElectron Density= 6.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Andesine is Not Radioactive

Andesine Classification

Dana Class:

76.01.03.03 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.03)Plagioclase series

76.01.03.00 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1

76.01.03.01 Albite NaAlSi3O8 C1 1

76.01.03.02 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

76.01.03.03 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

76.01.03.04 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

76.01.03.05 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

76.01.03.06 Anorthite CaAl2Si2O8 P1,I1 1

Strunz Class:

09.FA.35 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.35 Albite NaAlSi3O8 C1 1

09.FA.35 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

09.FA.35 Anorthite CaAl2Si2O8 P1,I1 1

09.FA.35 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

09.FA.35 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

09.FA.35 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

09.FA.35 Reedmergnerite NaBSi3O8 C1 1

09.FA.35 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1

Other Andesine Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Andesine

(Na,Ca)(Si,Al)4O8
Dana No: 76.01.03.03 Strunz No: 09.FA.35
Locality:

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