Ashcroftine-(Y) Mineral Data

Ashcroftine-(Y) Mineral Data
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General Ashcroftine-(Y) Information

Help on Chemical Formula: Chemical Formula: K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8•8(H2O)
Help on Composition: Composition: Molecular Weight = 3,810.20 gm
   Potassium   5.13 %  K     6.18 % K2O
   Sodium      3.02 %  Na    4.07 % Na2O
   Calcium     2.10 %  Ca    2.94 % CaO
   Yttrium    23.33 %  Y    29.63 % Y2O3
   Silicon    20.64 %  Si   44.15 % SiO2
   Hydrogen    0.42 %  H     3.78 % H2O
   Carbon      2.52 %  C     9.24 % CO2
   Oxygen     42.83 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K5Na5Y10Ca2Si28O70(CO3)8•8(H2O)
Help on Environment: Environment: In nepheline syenites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1933
Help on Locality: Locality: From Narssarssuk, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frederick Noel Ashcroft (1878-1949), benefactor to the British Museum (Natural History), London, England.
Help on Name Pronunciation: Name Pronunciation: Ashcroftine-(Y) + Pronunciation Say ASHCROFTINE-(Y)
Help on Synonym: Synonym: ICSD 202506
  PDF 22-508
 

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Ashcroftine-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.72984
Help on Cell Dimensions: Cell Dimensions: a = 23.994, c = 17.512, Z = 4; V = 10,081.87 Den(Calc)= 2.51
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 17.1(1), 12.043(0.8), 7.615(0.6),2.687(0.5), 3.114(0.5), 5.379(0.35), 6.014(0.3),
Click Here for Large Ashcroftine-(Y) Structure Window Crystal Structure:

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Moore P B , Sen Gupta P K , Schlemper E O , Merlino S , American Mineralogist , 72 (1987) p.1176-1189, Ashcroftine, ca. K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140).16H2O, a, structure with enormous polyanions, Sample: investigated by Moore, Sen Gupta, Schlemper

View Additional jPOWD Structure files for Ashcroftine-(Y)
[1]
 

Physical Properties of Ashcroftine-(Y)

Help on Cleavage: Cleavage: {100} Perfect, {001} Distinct
Help on Color: Color: Light violet, Pink, Pinkish brown, Deep violet.
Help on Density: Density: 2.61
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white
 

Optical Properties of Ashcroftine-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2158,KPDmeas= 0.2076,KC= 0.2006
Ncalc = 1.5 - 1.52
Help on Optical Data: Optical Data: Uniaxial (+), w=1.536-1.537, e=1.545-1.549, bire=0.0090-0.0120.
 

Calculated Properties of Ashcroftine-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Ashcroftine-(Y) =2.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAshcroftine-(Y) = 29.86 barns/electron
U=PEAshcroftine-(Y) x relectron= 75.75 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 71.98 (Gamma Ray American Petroleum Institute Units)
Concentration of Ashcroftine-(Y) per GRapi unit = 1.39 (%)

Estimated Radioactivity from Ashcroftine-(Y) - barely detectable

 

Ashcroftine-(Y) Classification
Help on Dana Class: Dana Class: 70.03.01.01 (70)Inosilicate Column or Tube Structures
  (70.03)with balo-silicates
  (70.03.01)Dana Group
 
70.03.01.01 Ashcroftine-(Y) K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: 09.DN.15 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DN -Inosilicates with 6-periodic double chains
 
09.DN.15 Ashcroftine-(Ce)* K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m
 
09.DN.15 Ashcroftine-(Y) K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m
 

Other Ashcroftine-(Y) Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ashcroftine-(Y) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Ashcroftine-(Y) Specimen Label here :

Ashcroftine-(Y)

K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8•8(H2O)
Dana No: 70.03.01.01 Strunz No: 09.DN.15
Locality:

 

Notes: