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Ashcroftine-(Y)

Big Photo

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

Show Ashcroftine-(Y) Photos (15)
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
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

Physical Properties of Ashcroftine-(Y)

Colour:Pink
Hardness (Mohs):5

Crystallography of Ashcroftine-(Y)

Crystal System:Tetragonal

Optical Data of Ashcroftine-(Y)

Type:Uniaxial (+)
RI values: nω = 1.536 - 1.537 nε = 1.545 - 1.549
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

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
[HSiO
 
4
]
 
3
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
[SiO
 
3
(OH)]
 
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

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)

    Hide Locality List
    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.
    (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
        • Tivoli
          • Osteria dell'Osa
    		Collection of Barry Murphy, Micromount specimen catalogue number 00875
    Mineral and/or Locality
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