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Parafransoletite

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Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
© 2004 JBS

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Formula:
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
 · 4H
 
2
O
System:TriclinicColour:Colorless, White
Hardness:2½
Name:Named for its dimorphous relationship with fransoletite.
This page provides mineralogical data about Parafransoletite.

Classification of Parafransoletite

IMA status:Approved 1989
Strunz 8th edition ID:7/C.03-15
Nickel-Strunz 10th (pending) edition ID:8.CA.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
Dana 7th edition ID:40.5.2.1
Dana 8th edition ID:40.5.2.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
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Type Occurrence of Parafransoletite

Type Locality:Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
Year of Discovery:1989

Physical Properties of Parafransoletite

Lustre:Vitreous, Silky
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless, White
Streak:White
Hardness (Mohs):2½
Cleavage:None Observed
Density (measured):2.54 g/cm3
Density (calculated):2.27 g/cm3

Crystallography of Parafransoletite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 7.32Å, b = 7.69Å, c = 7.06Å
α = 94.9°, β = 96.82°, γ = 101.86°
Ratio:a:b:c = 0.952 : 1 : 0.918
Unit Cell Volume:V 385.48 ų
Z:1

Optical Data of Parafransoletite

Type:Biaxial (+)
RI values: nα = 1.562 nβ = 1.564 nγ = 1.588
2V:Measured: 33° , Calculated: 34°
Maximum Birefringence:δ = 0.026

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

Chemical Properties of Parafransoletite

Formula:
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
 · 4H
 
2
O
Essential elements:Be, Ca, H, O, P
All elements listed in formula:Be, Ca, H, O, P

Relationship of Parafransoletite 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.10Ehrleite
Ca
 
4
Be
 
3
Zn
 
2
(PO
 
4
)
 
6
 · 9H
 
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

Other Names for Parafransoletite

Synonyms:
IMA1989-049Parafransoleite
Other Languages:
German:Parafransoleit
Parafransoletit
Russian:Парафрансолетит
Spanish:Parafransoleita
Parafransoletita

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 Parafransoletite

Reference List:

- +
Kampf, A.R., Dunn, A.R., Foord, E.E. (1992): Parafransoletite, a new dimorph of fransoletite from the Tip Top Pegmatite, Custer, South Dakota. The American Mineralogist, 77, 843-847.

Internet Links for Parafransoletite

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

    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
    		Kampf, A.R., Dunn, A.R., Foord, E.E. (1992): Parafransoletite, a new dimorph of fransoletite from the Tip Top Pegmatite, Custer, South Dakota. The American Mineralogist, 77, 843-847.
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