Andesine Mineral Data

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.

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 - PinacoidalH-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),

Forms:

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Forms: [ 0 0 1] [ 1 0 0] [ 1 0 1] [ 0 1 0]

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Crystal Structure:

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FitzGerald J D , Parise J B , Mackinnon I D R , American Mineralogist , 71 (1986) p.1399-1408, Average structure of an An48 plagioclase from the Hogarth Ranges, Sample: Neutron data

View Additional jPOWD Structure files for Andesine
[1]

Physical Properties of Andesine

Cleavage:

[001] Perfect, [010] Good

Color:

Colorless, Gray, Yellow green, White.

Density:

2.66 - 2.68, Average = 2.67

Diaphaniety:

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

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:

r_electron=2.65 gm/cc
note: r_Andesine=2.67 gm/cc.

Fermion Index

Fermion Index = 0.013
Boson Index = 0.987

Photoelectric:

PE_Andesine= 2.27 barns/electron
U=PE_Andesine x r_electron= 6.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Andesine is Not Radioactive

Andesine Classification

Dana Class:

76.1.3.3 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.3)Plagioclase series

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

76.1.3.1 Albite NaAlSi3O8 C1 1

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

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

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

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

76.1.3.6 Anorthite CaAl2Si2O8 P1,I1 1

Strunz Class:

VIII/J.07-40 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series

VIII/J.07-10 Anorthoclase (Na,K)AlSi3O8 C1 1

VIII/J.07-20 Albite NaAlSi3O8 C1 1

VIII/J.07-30 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-40 Andesine (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-50 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-60 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-70 Anorthite CaAl2Si2O8 P1,I1 1

VIII/J.07-75 Dmisteinbergite CaAl2Si2O8 P 6/mmm 6/m 2/m 2/m

VIII/J.07-80 Svyatoslavite CaAl2Si2O8 P 2₁ 2

VIII/J.07-90 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

VIII/J.07-100 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

VIII/J.07-110 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

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: 76.1.3.3 Strunz No: VIII/J.07-40
Locality:

Notes: