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Ashcroftine-(Y)

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About Ashcroftine-(Y)Hide

Frederick Noel Ashcroft
Formula:
K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2O
Colour:
Pink
Lustre:
Sub-Vitreous, Waxy, Silky
Hardness:
5
Specific Gravity:
2.61
Crystal System:
Tetragonal
Name:
Named by Max Hutchinson Hey and Frederick Allen Bannister in honor of Frederick Noel Ashcroft [August 28, 1878 Wavertree, near Liverpool, United Kingdom - April 4, 1949 London, United Kingdom], well known British mineral collector.

See also "Ashcroftine-(Ce)".


Classification of Ashcroftine-(Y)Hide

Approved, 'Grandfathered' (first described prior to 1959)
9.DN.15

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains
70.3.1.1

70 : INOSILICATES Column or Tube Structures
3 : Column or Tube Structures with balo-silicates
14.8.9

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al

Physical Properties of Ashcroftine-(Y)Hide

Sub-Vitreous, Waxy, Silky
Transparency:
Transparent
Colour:
Pink
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{100}, also {001} good
Fracture:
Irregular/Uneven
Density:
2.61 g/cm3 (Measured)    2.60 g/cm3 (Calculated)

Optical Data of Ashcroftine-(Y)Hide

Type:
Uniaxial (+)
RI values:
nω = 1.536 - 1.537 nε = 1.545 - 1.549
Birefringence:
0.010
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of Ashcroftine-(Y)Hide

Formula:
K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2O
IMA Formula:
K5Na5Y12Si28O70(OH)2(CO3)8 · 8H2O

Crystallography of Ashcroftine-(Y)Hide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Cell Parameters:
a = 23.99 Å, c = 17.51 Å
Ratio:
a:c = 1 : 0.73
Unit Cell V:
10,077.36 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Acicular, rod-like

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
17.00 (100)
12.0 (90)
7.62 (60)
7.10 (20)
6.01 (30)
5.38 (30)
3.11 (50)
2.69 (50)
Comments:
22-508

Type Occurrence of Ashcroftine-(Y)Hide

Other Language Names for Ashcroftine-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite5 photos of Ashcroftine-(Y) associated with Calcite on mindat.org.
Fluorite3 photos of Ashcroftine-(Y) associated with Fluorite on mindat.org.
Elpidite2 photos of Ashcroftine-(Y) associated with Elpidite on mindat.org.
Aegirine1 photo of Ashcroftine-(Y) associated with Aegirine on mindat.org.
Polylithionite1 photo of Ashcroftine-(Y) associated with Polylithionite on mindat.org.
Graphite1 photo of Ashcroftine-(Y) associated with Graphite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DN.05EmeleusiteLi2Na4Fe2Si12O30Orth.
9.DN.05TuhualiteNaFe2+Fe3+Si6O15Orth.
9.DN.05ZektzeriteLiNaZrSi6O15Orth.
9.DN.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.8.1Thalénite-(Y)Y3Si3O10FMon.
14.8.2Keiviite-(Y)Y2Si2O7
14.8.3Keiviite-(Yb)Yb2Si2O7Mon. 2/m : B2/m
14.8.4Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
14.8.5ThortveititeSc2Si2O7Mon.
14.8.6Sazhinite-(Ce)Na2CeSi6O14•6H2O
14.8.7Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
14.8.8Iraqite-(La)KCa2(La,Ce,Th)Si8O20Tet.
14.8.10Nordite-(La)(La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
14.8.11Nordite-(Ce)(Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
14.8.12JervisiteNaSc3+Si2O6Mon.
14.8.13Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
14.8.14CascanditeCa(Sc,Fe3+)(HSi3O9)Tric. 1

Fluorescence of Ashcroftine-(Y)Hide

Not fluorescent.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ashcroftine-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 55: 1818.
Moore, P.B., Sen Gupta, P.K., Schlemper, E.O., and Merlino, S.(1987): Ashcroftine, K10Na10(Y,Ca)24(OH)4(CO3) 16(Si56O140)·16H2O, a structure with enormous polyanions. American Mineralogist: 72, 1176-1189.

Internet Links for Ashcroftine-(Y)Hide

Localities for Ashcroftine-(Y)Hide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
Denmark (TL)
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Igaliku (Igaliko)
          • Narsaarsuk Plateau
Nature,(1932) 130, p. 858 and Mineralogical Magazine(1933) 23, 305-308; Bøgghild, O.B. (1953): The Mineralogy of Greenland. Meddelelser om Grønland, Bd. 149. Nr. 3., C.A. Reitzels Forlag, Copenhagen. 445 p (p.410-411)
Italy
 
  • Latium
    • Rome Province
      • Rome
        • Osteria dell'Osa
Mineral and/or Locality  
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