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Mccrillisite

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About MccrillisiteHide

Formula:
NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
Colour:
White to colorless
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
3.125
Crystal System:
Tetragonal
Member of:
Name:
In honor of the late Dean McCrillis (February 8, 1931 in Quincy, Massachusetts - January 15, 1989), mineral dealer and his son, Philip.
Unique combination of elements. The only known Cs phosphate mineral. Also the sixth non-silicate oxysalt with species-defining Cs, the other ones being cesiodymite (sulphate), caesiumpharmacosiderite (arsenate), londonite and ramanite-(Cs) (borates), and margaritasite (vanadate).


Classification of MccrillisiteHide

Approved
8.CA.20

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.5.4.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O

Physical Properties of MccrillisiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
White to colorless
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.125(5) g/cm3 (Measured)    3.30 g/cm3 (Calculated)

Optical Data of MccrillisiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.634() nε = 1.645(2)
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
anomalously biaxial, with 2V to 5 degrees

Chemical Properties of MccrillisiteHide

Formula:
NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
Common Impurities:
Al,Ca,Mg,Mn,Fe,Sr,K,Zn,Hf,Rb,F

Crystallography of MccrillisiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/amd
Setting:
I41/amd
Cell Parameters:
a = 6.573(2) Å, c = 17.28(2) Å
Ratio:
a:c = 1 : 2.629
Unit Cell V:
746.57 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of MccrillisiteHide

General Appearance of Type Material:
bipyramidal crystals as much as 1.2 mm in maximum dimension
Place of Conservation of Type Material:
(catalogue number NMNH 170853) has been deposited at the U.S. National Museum (Smithsonian Institution).
Geological Setting of Type Material:
late-staqe hydrothermal alteration of earlier-formed Zr-bearing minerals in the pegmatite.

Synonyms of MccrillisiteHide

Other Language Names for MccrillisiteHide

Relationship of Mccrillisite to other SpeciesHide

Member of:
Other Members of this group:
GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Siderite1 photo of Mccrillisite associated with Siderite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2·4H2O Tric. 1 : P1
8.CA.ApexiteNaMg(PO4)·9H2OTric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OMon.
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OTric. 1 : P1
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2OTric. 1 : P1
8.CA.15FaheyiteBe2Mn2+Fe3+2(PO4)4 · 6H2OTrig. 3 2 : P31 2 1
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet.
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZn3(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric.
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2OMon.
8.CA.45ScholziteCaZn2(PO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.50KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(HPO4)4(H2PO4)2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

40.5.4.KaňkiteFeAsO4 · 3.5H2OMon.
40.5.4.1GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
40.5.4.3SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet.

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 MccrillisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
New Minerals (1997), New Minerals 1990-1994.
Foord, E. E., Brownfield, M. E., Lichte, F. E., Davis, A. M. and Sutley, S. J. (1994): Mccrillisite, NaCs(Be,Li)Zr2(PO4)4.1-2H2O, a new mineral species from Mount Mica, Oxford County, Maine, and new data for gainesite. Can. Mineral. 32, 839-42.

Internet Links for MccrillisiteHide

Localities for MccrillisiteHide

ⓘ - 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.
USA (TL)
 
  • Maine
    • Oxford Co.
      • Paris
Canadian Mineralogist(1994) 32, 839-842 King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates.
Mineral and/or Locality  
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