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Mccrillisite

A valid IMA mineral species
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00910070015212329738656.jpg
Mccrillisite, etc.

Mount Mica Quarry, Paris, Oxford County, Maine, USA
01604280015848417637175.jpg
Mccrillisite

Mount Mica Quarry, Paris, Oxford County, Maine, USA
00910070015212329738656.jpg
Mccrillisite, etc.

Mount Mica Quarry, Paris, Oxford County, Maine, USA
01604280015848417637175.jpg
Mccrillisite

Mount Mica Quarry, Paris, Oxford County, Maine, USA
00910070015212329738656.jpg
Mccrillisite, etc.

Mount Mica Quarry, Paris, Oxford County, Maine, USA
01604280015848417637175.jpg
Mccrillisite

Mount Mica Quarry, Paris, Oxford County, Maine, USA
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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:
Gainesite Group
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).


Unique IdentifiersHide

Mindat ID:
7174
Long-form identifier:
mindat:1:1:7174:7
GUID
(UUID V4):
ea413d2d-49fb-48d4-9b8d-034a6ccb0647

IMA Classification of MccrillisiteHide

IMA status:
Approved
First published:
1994

Classification of MccrillisiteHide

Strunz-mindat (2024):
8.CA.20

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

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
McrIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MccrillisiteHide

Lustre:
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(2) 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.

Chemistry of MccrillisiteHide

Mindat Formula:
NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
Elements listed:
Be, Cs, H, Li, Na, O, P, Zr - search for minerals with similar chemistry
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
Morphology:
Bipyramidal. The dominant form is {111}, and the minor form is {001}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.060 Å(100)
6.159 Å(90)
4.326 Å(80)
3.281 Å(80)
4.099 Å(40)
2.896 Å(30)
1.849 Å(30)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23)

Type Occurrence of MccrillisiteHide

Type Locality:
ⓘ Mount Mica Quarry, Paris, Oxford County, Maine, USA
General Appearance of Type Material:
Bipyramidal crystals as much as 1.2 mm in maximum dimension. Many crystals have a crackled appearance.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 170853.
Geological Setting of Type Material:
Late-staqe hydrothermal alteration of earlier-formed Zr-bearing minerals in the pegmatite.
Associated Minerals at Type Locality:
AlbiteQuartzAlmandineMuscoviteSiderite
FluorapatiteElbaiteLepidoliteBerylMontebrasite
RhodochrositeCassiteriteColumbite-(Mn)UraniniteLöllingite
ZirconEosphoriteMoraesiteRoscheriteKosnarite

Synonyms of MccrillisiteHide

Other Language Names for MccrillisiteHide

Relationship of Mccrillisite to other SpeciesHide

Member of:
Gainesite Group
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. 4/mmm (4/m 2/m 2/m) : I41/amd

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Mccrillisite associated with SideriteFeCO3

Related Minerals - Strunz-mindat GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2 · 4H2O Tric. 1 : P1
8.CA.ApexiteNaMg(PO4) · 9H2OTric. 1 : P1
8.CA.BrandãoiteBeAl2(PO4)2(OH)2(H2O)5Tric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OMon. 2/m : P21/b
8.CA.05ParafransoletiteCa3Be2(PO4)2(PO3OH)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. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZnZn2(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.30NizamoffiteMn2+Zn2(PO4)2(H2O)4Orth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.30Unnamed (Mg-analogue of Hopeite)Mg3(PO4)2 · 4H2O
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric. 1 : P1
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.42SteinmetziteZn2Fe3+(PO4)2(OH) · 3H2OTric. 1 : P1
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[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1
8.CA.70ReaphookhilliteMgZn2(PO4)2 · 4H2OTric. 1 : P1
8.CA.75StergiouiteCaZn2(AsO4)2 · 4H2OMon. m : Pb
8.CA.80LimousiniteBaCa[Be4P4O16] · 6H2OMon. 2/m : P21/b
8.CA.85MinjiangiteBaBe2(PO4)2Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
8.CA.85Wilancookite(Ba5Li2◻)Ba6Be24P24O96 · 26H2OIso. 2 3 : I2 3

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.

Internet Links for MccrillisiteHide

References for MccrillisiteHide

Localities for MccrillisiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Maine
    • Oxford County
      • Paris
Foord, E. E., Brownfield, M. E., Lichte, F. E., Davis, A. M., 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. The Canadian Mineralogist, 32 (4) 839-842
King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey.
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