Mineralogy Database

Sanidine Mineral Data

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General Sanidine Information

Help on Chemical  Formula: Chemical Formula: (K,Na)(Si,Al)4O8
Help on Composition: Composition: Molecular Weight = 274.30 gm
   Potassium  10.69 %  K    12.88 % K2O
   Sodium      2.10 %  Na    2.82 % Na2O
   Aluminum    9.84 %  Al   18.59 % Al2O3
   Silicon    30.72 %  Si   65.71 % SiO2
   Oxygen     46.66 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.75Na0.25AlSi3O8
Help on Environment: Environment: Acid volcanic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1808
Help on Locality: Locality: Common world wide occurrences. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek sanis - "little plate" and idos - "to see."
Help on Name Pronunciation: Name Pronunciation: Sanidine Say SANIDINE
 

Sanidine Image

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  Sanidine

Comments: Blocky, opalescent crystal of sanidine.
Location: Mina La Pili, Carmago, Chihuahua, Mexico. Scale: Crystal size 3x2 cm.
© Dave Barthelmy

Sanidine Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6588:1:0.5534
Help on Cell Dimensions: Cell Dimensions: a = 8.562, b = 12.996, c = 7.193, Z = 4; beta = 116.016° V = 719.28 Den(Calc)= 2.53
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.26(1), 3.22(0.9), 3.27(0.75),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
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I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Sanidine

Help on Cleavage: Cleavage: {001} Perfect, {010} Good
Help on Color: Color: Colorless, White, Gray, Yellowish white, Reddish white.
Help on Density: Density: 2.52
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Sanidine

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2076,KPDmeas= 0.2085,KC= 0.2058
Ncalc = 1.52
Help on Optical Data: Optical Data: Biaxial (-), a=1.518-1.525, b=1.523-1.53, g=1.525-1.531, bire=0.0060-0.0070, 2V(Calc)=48-64, 2V(Meas)=60-0. Dispersion r < v distinct.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
 

Calculated Properties of Sanidine

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.51 gm/cc
note: Specific Gravity of Sanidine =2.53 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESanidine = 2.57 barns/electron
U=PESanidine x relectron= 6.44 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 152.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Sanidine per GRapi unit = 0.65 (%)

Estimated Radioactivity from Sanidine - barely detectable

 

Sanidine Classification

Help on  Dana Class: Dana Class: 76.01.01.02 (76)Tectosilicate Al-Si Framework
  (76.01)with Al-Si frameworks
  (76.01.01)K (Na,Ba) feldspars
 
76.01.01.01 Orthoclase KAlSi3O8 C 2/m 2/m
 
76.01.01.02 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m
 
76.01.01.03 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m
 
76.01.01.04 Celsian BaAl2Si2O8 I21/c 2/m
 
76.01.01.05 Microcline KAlSi3O8 C1 1
 
76.01.01.06 Anorthoclase (Na,K)AlSi3O8 C1 1
 
76.01.01.07 Rubicline! (Rb,K)AlSi3O8 P1 1
 
76.01.01.08 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m
Help on  Strunz Class: Strunz Class: 09.FA.30 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
 
09.FA.30 Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 21 or P 21/m Mono
 
09.FA.30 Celsian BaAl2Si2O8 I21/c 2/m
 
09.FA.30 Anorthoclase (Na,K)AlSi3O8 C1 1
 
09.FA.30 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m
 
09.FA.30 Orthoclase KAlSi3O8 C 2/m 2/m
 
09.FA.30 Microcline KAlSi3O8 C1 1
 
09.FA.30 Rubicline! (Rb,K)AlSi3O8 P1 1
 
09.FA.30 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m
 

Other Sanidine Information

Help on See Also: See Also: Links to other databases for Sanidine :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineral and Gemstone Kingdom
16 - Mineralienatlas (Deutsch)
17 - Minerals in Thin Sections-Humboldt State
18 - Online Mineral Museum
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - UCLA - Petrography Thin-Sections
22 - WWW-MINCRYST

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Sanidine

(K,Na)(Si,Al)4O8
Dana No: 76.01.01.02 Strunz No: 09.FA.30
Locality:

 

Notes:

 

 


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