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Ehrleite

Big Photo

Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
© Knut Eldjarn

Formula:
Ca
 
4
Be
 
3
Zn
 
2
[PO
 
4
]
 
6
 · 9H
 
2
O
System:TriclinicColour:Colorless, White
Hardness:3½
Name:Named for Howard Ehrle of Miles City, Montana, who found the mineral
This page provides mineralogical data about Ehrleite.

Classification of Ehrleite

IMA status:Approved 1983
Strunz 8th edition ID:7/C.03-20
Nickel-Strunz 10th (pending) edition ID:8.CA.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
Dana 7th edition ID:40.5.6.1
Dana 8th edition ID:40.5.6.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
Hey's CIM Ref.:19.6.9

19 : Phosphates
6 : Phosphates of Zn
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Type Occurrence of Ehrleite

Type Locality:Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
Year of Discovery:1985

Physical Properties of Ehrleite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless, White
Streak:White
Hardness (Mohs):3½
Cleavage:Poor/Indistinct
Fracture:Conchoidal
Density (measured):2.64 g/cm3
Density (calculated):2.49 g/cm3

Crystallography of Ehrleite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 7.13Å, b = 7.43Å, c = 12.479Å
α = 94.31°, β = 102.07°, γ = 82.65°
Ratio:a:b:c = 0.96 : 1 : 1.68
Unit Cell Volume:V 639.35 ų
Z:2

Optical Data of Ehrleite

Type:Biaxial (+)
RI values: nα = 1.556 nβ = 1.560 nγ = 1.580
2V:Measured: 62° , Calculated: 50°
Maximum Birefringence:δ = 0.024

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r > v strong

Chemical Properties of Ehrleite

Formula:
Ca
 
4
Be
 
3
Zn
 
2
[PO
 
4
]
 
6
 · 9H
 
2
O
Essential elements:Be, Ca, H, O, P, Zn
All elements listed in formula:Be, Ca, H, O, P, Zn

Relationship of Ehrleite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CA.05Fransoletite
Ca
 
3
Be
 
2
[HPO
 
4
|PO
 
4
]
 
2
 · 4H
 
2
O
8.CA.05Parafransoletite
Ca
 
3
Be
 
2
[HPO
 
4
|PO
 
4
]
 
2
 · 4H
 
2
O
8.CA.15Faheyite
(Mn,Mg,Na)Be
 
2
Fe
 
2
(PO
 
4
)
 
4
·6H
 
2
O
8.CA.20Gainesite
Na(Na,K)(Be,Li)Zr
 
2
[PO
 
4
]
 
4
 · 1.5-2H
 
2
O
8.CA.20Mccrillisite
NaCs(Be,Li)Zr
 
2
(PO
 
4
)
 
4
·1-2H
 
2
O
8.CA.20Selwynite
NaK(Be,Al)Zr
 
2
(PO
 
4
)
 
4
·2H
 
2
O
8.CA.25Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
·38H
 
2
O
8.CA.30Hopeite
Zn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CA.35Warikahnite
Zn
 
3
(AsO
 
4
)
 
2
·2H
 
2
O
8.CA.40Phosphophyllite
Zn
 
2
Fe(PO
 
4
)
 
2
·4H
 
2
O
8.CA.45Parascholzite
CaZn
 
2
(PO
 
4
)
 
2
·2H
 
2
O
8.CA.45Scholzite
CaZn
 
2
(PO
 
4
)
 
2
·2H
 
2
O
8.CA.50Keyite
Cu
2+
3
Zn
 
4
Cd
 
2
(AsO
 
4
)
 
6
·2H
 
2
O
8.CA.55Pushcharovskite
K
 
0.6
Cu
 
18
[AsO
 
2
(OH)
 
2
]
 
4
[AsO
 
3
OH]
 
10
(AsO
 
4
)(OH)
 
9.6
·18.6H
 
2
O
8.CA.60Prosperite
CaZn
 
2
[OH|HAsO
 
4
|AsO
 
4
]
8.CA.65Gengenbachite
KFe
3+
3
[H
 
2
PO
 
4
|(HPO
 
4
)
 
2
]
 
2
 · 6H
 
2
O
8.CA.70Parahopeite
Zn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.6.1Tarbuttite
Zn
 
2
[OH|PO
 
4
]
19.6.2Spencerite
Zn
 
4
[OH|PO
 
4
]
 
2
 · 3H
 
2
O
19.6.3Hopeite
Zn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
19.6.4Parahopeite
Zn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
19.6.5Veszelyite
(Cu,Zn)
 
2
Zn(PO
 
4
)
 
2
·2H
 
2
O
19.6.6Kipushite
(Cu,Zn)
 
5
Zn[(OH)
 
3
|PO
 
4
]
 
2
 · H
 
2
O
19.6.7Scholzite
CaZn
 
2
(PO
 
4
)
 
2
·2H
 
2
O
19.6.8Parascholzite
CaZn
 
2
(PO
 
4
)
 
2
·2H
 
2
O
19.6.10Faustite
(Zn,Cu)Al
 
6
[(OH)
 
4
|(PO
 
4
)
 
2
]
 
2
 · 4H
 
2
O
19.6.11Aheylite
(Fe
2+
 
,Zn)Al
 
6
[(OH)
 
4
|(PO
 
4
)
 
2
]
 
2
 · 4H
 
2
O
19.6.12Jungite
Ca
 
2
Zn
 
4
Fe
3+
8
[OH|PO
 
4
]
 
9
 · 16H
 
2
O
19.6.13Schoonerite
ZnMn
2+
 
Fe
2+
2
Fe
3+
 
(PO
 
4
)
 
3
(OH)
 
2
 · 9H
 
2
O
19.6.14Phosphophyllite
Zn
 
2
Fe(PO
 
4
)
 
2
·4H
 
2
O

Other Names for Ehrleite

Synonyms:
IMA1983-039
Other Languages:
German:Ehrleit
Russian:Эрлеит
Spanish:Ehrleita

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 Ehrleite

Reference List:American Mineralogist: 74: 504-505.

Canadian Mineralogist: 25: 767-774.

Internet Links for Ehrleite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Ehrleite in the Natural History Museum (London) online catalogue
  • Ehrleite details from Handbook of Mineralogy (PDF)
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    Localities for Ehrleite

    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.
    USA
     
    • South Dakota
      • Custer Co.
        • Custer District
          • Fourmile
    		Rocks & Minerals: 60: 117.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 11:46:58