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Ashcroftine-(Y)

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Big Photo

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© Jonathan Z. Levinger

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Formula:
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
 · 8H
 
2
O
System:TetragonalColour:Pink
Hardness:5
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.
This page provides mineralogical data about Ashcroftine-(Y).

Classification of Ashcroftine-(Y)

IMA status:Approved
Strunz 8th edition ID:8/F.36-30
Nickel-Strunz 10th (pending) edition ID:9.DN.15

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains
Dana 8th edition ID:70.3.1.1

70 : INOSILICATES Column or Tube Structures
3 : Column or Tube Structures with balo-silicates
Hey's CIM Ref.:14.8.9

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
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Type Occurrence of Ashcroftine-(Y)

Type Locality:Narssârssuk pegmatite (Narsarsuk pegmatite), Narssârssuk (Narsarsuk), Igaliku (Igaliko), Narsaq, Kitaa (West Greenland) Province, Greenland
Year of Discovery:1924

Physical Properties of Ashcroftine-(Y)

Lustre:Sub-Vitreous, Waxy, Silky
Diaphaneity (Transparency):Transparent
Colour:Pink
Streak:White
Hardness (Mohs):5
Tenacity:Brittle
Cleavage:Perfect
{100}, also {001} good
Fracture:Irregular/Uneven
Density (measured):2.61 g/cm3
Density (calculated):2.60 g/cm3

Crystallography of Ashcroftine-(Y)

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

Optical Data of Ashcroftine-(Y)

Type:Uniaxial (+)
RI values: nω = 1.536 - 1.537 nε = 1.545 - 1.549
Birefringence:0.010
Maximum Birefringence:δ = 0.009

Chart 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)

Formula:
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
 · 8H
 
2
O
Essential elements:C, H, K, Na, O, Si, Y
All elements listed in formula:C, Ca, H, K, Na, O, Si, Y

Relationship of Ashcroftine-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DN.05Emeleusite
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
9.DN.05Tuhualite
(Na,K)
 
2
Fe
 
2
Fe
 
2
Si
 
12
O
 
30
 · H
 
2
O
9.DN.05Zektzerite
LiNa(Zr,Ti,Hf)Si
 
6
O
 
15
9.DN.10Semenovite-(Ce)
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
Related Minerals - Hey's Index Grouping:

- +
14.8.1Thalénite-(Y)
Y
 
3
(Si
 
3
O
 
10
)(OH)
14.8.2Keiviite-(Y)
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
14.8.3Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
14.8.4Tombarthite-(Y)
Y
 
4
(Si,H
 
4
)
 
4
O
 
12-x
(OH)
 
4+2x
14.8.5Thortveitite
(Sc,Y)
 
2
Si
 
2
O
 
7
14.8.6Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
14.8.7Monteregianite-(Y)
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
 · 10H
 
2
O
14.8.8Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
14.8.10Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.11Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.12Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
14.8.13Cerite-(Ce)
(Ce,Ca)
 
9
(Fe,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
14.8.14Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)

Other Names for Ashcroftine-(Y)

Other Languages:
German:Ashcroftin-(Y)
Russian:Ашкрофтин

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning: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)

Reference List:

- +
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)

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    • Localities for Ashcroftine-(Y)

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Igaliku (Igaliko)
          • Narssârssuk (Narsarsuk)
    		Nature,(1932) 130, p. 858 and Min.Mag.(1933) 23, 305-308
    Italy
     
    • Latium
      • Rome Province
        • Rome
          • Osteria dell'Osa
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