Mccrillisite
A valid IMA mineral species
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About Mccrillisite
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.
Type Locality:
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 Identifiers
Mindat ID:
7174
Long-form identifier:
mindat:1:1:7174:7
GUID
(UUID V4):
(UUID V4):
ea413d2d-49fb-48d4-9b8d-034a6ccb0647
IMA Classification of Mccrillisite
Approved
First published:
1994
Classification of Mccrillisite
8.CA.20
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
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
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Mcr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Mccrillisite
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 Mccrillisite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
Anomalously biaxial, with 2V to 5 degrees.
Chemistry of Mccrillisite
Mindat Formula:
NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
Common Impurities:
Al,Ca,Mg,Mn,Fe,Sr,K,Zn,Hf,Rb,F
Crystallography of Mccrillisite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) |
Type Occurrence of Mccrillisite
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:
Synonyms of Mccrillisite
Other Language Names for Mccrillisite
German:Mccrillisit
Spanish:Mccrillisita
Relationship of Mccrillisite to other Species
Member of:
Other Members of this group:
Common Associates
Related Minerals - Strunz-mindat Grouping
8.CA. | Davidlloydite | Zn3(AsO4)2 · 4H2O |
8.CA. | Apexite | NaMg(PO4) · 9H2O |
8.CA. | Brandãoite | BeAl2(PO4)2(OH)2(H2O)5 |
8.CA.05 | Fransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
8.CA.05 | Parafransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
8.CA.10 | Ehrleite | Ca4Be3Zn2(PO4)6 · 9H2O |
8.CA.15 | Faheyite | Be2Mn2+Fe3+2(PO4)4 · 6H2O |
8.CA.20 | Gainesite | Na(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O |
8.CA.20 | Selwynite | NaK(Be,Al)Zr2(PO4)4 · 2H2O |
8.CA.25 | Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O |
8.CA.30 | Hopeite | ZnZn2(PO4)2 · 4H2O |
8.CA.30 | Arsenohopeite | Zn3(AsO4)2 · 4H2O |
8.CA.30 | Nizamoffite | Mn2+Zn2(PO4)2(H2O)4 |
8.CA.30 | Unnamed (Mg-analogue of Hopeite) | Mg3(PO4)2 · 4H2O |
8.CA.35 | Warikahnite | Zn3(AsO4)2 · 2H2O |
8.CA.40 | Phosphophyllite | Zn2Fe(PO4)2 · 4H2O |
8.CA.42 | Steinmetzite | Zn2Fe3+(PO4)2(OH) · 3H2O |
8.CA.45 | Parascholzite | CaZn2(PO4)2 · 2H2O |
8.CA.45 | Scholzite | CaZn2(PO4)2 · 2H2O |
8.CA.50 | Keyite | Cu2+3Zn4Cd2(AsO4)6 · 2H2O |
8.CA.55 | Pushcharovskite | K0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2O |
8.CA.60 | Prosperite | Ca2Zn4(AsO4)4 · H2O |
8.CA.65 | Gengenbachite | KFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2O |
8.CA.70 | Parahopeite | Zn3(PO4)2 · 4H2O |
8.CA.70 | Reaphookhillite | MgZn2(PO4)2 · 4H2O |
8.CA.75 | Stergiouite | CaZn2(AsO4)2 · 4H2O |
8.CA.80 | Limousinite | BaCa[Be4P4O16] · 6H2O |
8.CA.85 | Minjiangite | BaBe2(PO4)2 |
8.CA.85 | Wilancookite | (Ba5Li2◻)Ba6Be24P24O96 · 26H2O |
Other Information
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 Mccrillisite
mindat.org URL:
https://www.mindat.org/min-7174.html
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References for Mccrillisite
Localities for Mccrillisite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
USA (TL) | |
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Mount Mica Quarry, Paris, Oxford County, Maine, USA