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Ehrleite

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

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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
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
 · 4H
 
2
O
8.CA.05Parafransoletite
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
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
 
4
)(HAsO
 
4
)
 
10
(H
 
2
AsO
 
4
)
 
4
(OH)
 
9.6
·18.6H
 
2
O
8.CA.60Prosperite
CaZn
 
2
(AsO
 
4
)(HAsO
 
4
)(OH)
8.CA.65Gengenbachite
KFe
3+
3
(HPO
 
4
)
 
4
(H
 
2
PO
 
4
)
 
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
(PO
 
4
)(OH)
19.6.2Spencerite
Zn
 
4
(PO
 
4
)
 
2
(OH)
 
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(PO
 
4
)
 
2
(OH)
 
6
 · 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
(PO
 
4
)
 
4
(OH)
 
8
 · 4H
 
2
O
19.6.11Aheylite
(Fe
2+
 
,Zn)Al
 
6
(PO
 
4
)
 
4
(OH)
 
8
 · 4H
 
2
O
19.6.12Jungite
Ca
 
2
Zn
 
4
Fe
3+
8
(PO
 
4
)
 
9
(OH)
 
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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Ehrleite details from Handbook of Mineralogy (PDF)
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    • Localities for Ehrleite

    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.
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    (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.
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