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Perloffite

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Big Photo

Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Hagendorf, Waidhaus, Vohenstrauß, Oberpfälzer Wald, Upper Palatinate, Bavaria, Germany
© Christian Rewitzer

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Formula:
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
System:MonoclinicColour:Brownish black, ...
Hardness:5
Member of:Bjarebyite Group
Name:For Lou Perloff (1907-2004) American lawyer and micromounter.


Bjarebyite Group

Classification of Perloffite

IMA status:Approved
Strunz 8th edition ID:7/B.29-40
Nickel-Strunz 10th (pending) edition ID:8.BH.20

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
Dana 8th edition ID:41.9.1.4

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)5(XO4)3Zq
Hey's CIM Ref.:19.5.15

19 : Phosphates
5 : Phosphates of Sr and Ba
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Type Occurrence of Perloffite

Type Locality:Big Chief Mine, Glendale, Keystone District, Pennington Co., South Dakota, USA
Place of Conservation of Type Material:Smithsonian Museum
Year of Discovery:1977

Physical Properties of Perloffite

Lustre:Adamantine, Vitreous
Diaphaneity (Transparency):Transparent
Colour:Brownish black, green-brown, black
Streak:Greenish yellow
Hardness (Mohs):5
Cleavage:Perfect
on {100}
Density (calculated):4.00 g/cm3

Crystallography of Perloffite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Space Group Setting:P21/m
Cell Parameters:a = 9.22Å, b = 12.42Å, c = 4.99Å
β = 100.39°
Ratio:a:b:c = 0.742 : 1 : 0.402
Unit Cell Volume:V 562.05 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals resemble spearheads, parallel and radial growths common. May be massive.

Optical Data of Perloffite

Type:Biaxial (-)
RI values: nα = 1.793 nβ = 1.803 nγ = 1.808
2V:Measured: 70° to 80°, Calculated: 70°
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r << v
Pleochroism:Visible
Comments:X=Z= dark greenish brown
Y= light greenish brown

Chemical Properties of Perloffite

Formula:
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
Essential elements:Ba, Fe, H, Mn, O, P
All elements listed in formula:Ba, Fe, H, Mn, O, P

Relationship of Perloffite to other Species

Member of:Bjarebyite Group
Other Members of Group:

- +
Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
Johntomaite
BaFe
2+
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
3
(OH)
 
3
Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
Related Minerals - Nickel-Strunz Grouping):

- +
8.BH.05Thadeuite
Ca(Mg,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,F)
 
2
8.BH.10Durangite
NaAl(AsO
 
4
)F
8.BH.10Isokite
CaMg(PO
 
4
)F
8.BH.10Lacroixite
NaAl(PO
 
4
)F
8.BH.10Maxwellite
NaFe
3+
 
(AsO
 
4
)F
8.BH.10Panasqueiraite
CaMg(PO
 
4
)(OH,F)
8.BH.10Tilasite
CaMg(AsO
 
4
)F
8.BH.15Drugmanite
Pb(Fe
3+
 
,Al)
 
2
(PO
 
4
)
 
2
(OH)
 
2
8.BH.20Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Cirrolite
Ca
 
3
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
 (?)
8.BH.20Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Johntomaite
BaFe
2+
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.25Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
4
(OH,F)
 
4
8.BH.25Palermoite
(Li,Na)
 
2
(Sr,Ca)Al
 
4
(PO
 
4
)
 
4
(OH)
 
4
8.BH.30Carminite
PbFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.30Sewardite
CaFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.35Adelite
CaMg(AsO
 
4
)(OH)
8.BH.35Arsendescloizite
PbZn(AsO
 
4
)(OH)
8.BH.35Austinite
CaZn(AsO
 
4
)(OH)
8.BH.35Cobaltaustinite
CaCo(AsO
 
4
)(OH)
8.BH.35Conichalcite
CaCu(AsO
 
4
)(OH)
8.BH.35Duftite
PbCu(AsO
 
4
)(OH)
8.BH.35Gabrielsonite
PbFe(AsO
 
4
)(OH)
8.BH.35Nickelaustinite
Ca(Ni,Zn)(AsO
 
4
)(OH)
8.BH.35Tangeite
CaCu(VO
 
4
)(OH)
8.BH.35Gottlobite
CaMg(VO
 
4
,AsO
 
4
)(OH)
8.BH.35Hermannroseite
CaCu(PO
 
4
)(OH)
8.BH.40Čechite
Pb(Fe
2+
 
,Mn
2+
 
)(VO
 
4
)(OH)
8.BH.40Descloizite
Pb(Zn,Cu)(VO
 
4
)(OH)
8.BH.40Mottramite
PbCu(VO
 
4
)(OH)
8.BH.40Pyrobelonite
PbMn
2+
 
(VO
 
4
)(OH)
8.BH.45Bayldonite
PbCu
 
3
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.45Vésigniéite
BaCu
 
3
(VO
 
4
)
 
2
(OH)
 
2
8.BH.50Paganoite
NiBi(AsO
 
4
)O
8.BH.55Jagowerite
BaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
8.BH.55Carlgieseckeite-(Nd)
NaNdCa
 
3
(PO
 
4
)
 
3
F
8.BH.60Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
(HPO
 
4
,PO
 
4
)
 
3
(SiO
 
4
,PO
 
4
)(OH)
 
4
8.BH.65Leningradite
PbCu
 
3
(VO
 
4
)
 
2
Cl
Related Minerals - Hey's Index Grouping:

- +
19.5.1Strontiowhitlockite
Sr
 
9
Mg(PO
 
4
)
 
6
(HPO
 
4
)
19.5.2Belovite-(Ce)
NaCeSr
 
3
(PO
 
4
)
 
3
F
19.5.3Goyazite
SrAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
 · H
 
2
O
19.5.4Goedkenite
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
19.5.5Palermoite
(Li,Na)
 
2
(Sr,Ca)Al
 
4
(PO
 
4
)
 
4
(OH)
 
4
19.5.6Nabaphite
NaBaPO
 
4
 · 9H
 
2
O
19.5.7Olgite
(Sr,Ba)(Na,Sr,REE)
 
2
Na(PO
 
4
)
 
2
19.5.8Nastrophite
Na(Sr,Ba)PO
 
4
 · 9H
 
2
O
19.5.9Jagowerite
BaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
19.5.10Gorceixite
BaAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
 · H
 
2
O
19.5.11Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
19.5.12Curetonite
Ba
 
4
Al
 
3
Ti(PO
 
4
)
 
4
(O,OH)
 
6
19.5.13Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
19.5.14Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
3
(OH)
 
3

Other Names for Perloffite

Synonyms:
IMA1976-002
Other Languages:
German:Perloffit
Russian:Перловит
Spanish:Perloffita

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 Perloffite

Reference List:

- +
Kampf, A.R. (1977): Mineralogical Record, 8, 112-114.

American Mineralogist (1977): 62: 1059.

Birch & Mumme (1988) Mineralogical Magazine, 52: 408-411.

Elliott, P.; Willis, A.C. (2011): The crystal structure of perloffite. Mineral. Mag. 75, 317-325.

Internet Links for Perloffite

Search Engines:
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    • External Links:
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  • Look for Perloffite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Perloffite details from Handbook of Mineralogy (PDF)
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    • Localities for Perloffite

    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.
    Hide Locality List
    (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.
    Australia
     
    • South Australia
      • Flinders Ranges
        • South Flinders Ranges
          • Wilmington
    		Mineral. Mag. 63, 735-741
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Oberpfälzer Wald
          • Vohenstrauß
            • Waidhaus
    		Mücke, A. (1987): Der Aufschluss, 38, 5-28.
    http://www.berthold-weber.de/h_miner.htm
    USA
     
    • South Dakota
      • Custer Co.
        • Custer District
          • Fourmile
    		Loomis, Tom (2011), "News from the Black Hills, South Dakota", Mineral News, to be published
      • Pennington Co.
        • Keystone District
          • Glendale
    		Rocks & Minerals: 60: 116.
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