Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Earlshannonite

Big Photo

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

Show Earlshannonite Photos (21)
Formula:
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
·4H
 
2
O
System:MonoclinicColour:Reddish-brown
Lustre:VitreousHardness:3 - 4
Name:For US mineralogist and chemist, Earl V. Shannon (1895-1981).


Arthurite Group.

Classification of Earlshannonite

IMA status:Approved 1983
Strunz 8th edition ID:7/D.08-30
Strunz 9th edition ID:8.DC.15
Nickel-Strunz 10th (pending) edition ID:8.DC.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
Dana 8th edition ID:42.11.20.4

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
Hey's CIM Ref.:19.12.21

19 : Phosphates
12 : Phosphates of Mn
mindat.org URL:http://www.mindat.org/min-1345.html
Please feel free to link to this page.

Type Occurrence of Earlshannonite

Type Locality:Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
Year of Discovery:1984

Physical Properties of Earlshannonite

Lustre:Vitreous
Colour:Reddish-brown
Hardness (Mohs):3 - 4

Crystallography of Earlshannonite

Crystal System:Monoclinic
Cell Parameters:a = 9.91Å, b = 9.66Å, c = 5.45Å
β = 93.95°
Ratio:a:b:c = 1.026 : 1 : 0.564
Unit Cell Volume:V 520.49 ų (Calculated from Unit Cell)

Optical Data of Earlshannonite

Type:Biaxial (-)
RI values: nα = 1.696 nβ = 1.745 nγ = 1.765
2V:Measured: 64° , Calculated: 62°
Maximum Birefringence:δ = 0.069

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

Chemical Properties of Earlshannonite

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

Relationship of Earlshannonite to other Species

Member of Group:
Arthurite Group:
M
2+
 
M
3+
2
(TO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.DC.05Nissonite
Cu
 
2
Mg
 
2
[OH|PO
 
4
]
 
2
 · 5H
 
2
O
8.DC.07Euchroite
Cu
 
2
[OH|AsO
 
4
] · 3H
 
2
O
8.DC.10Legrandite
Zn
 
2
[OH|AsO
 
4
] · H
 
2
O
8.DC.12Strashimirite
Cu
 
8
[OH|AsO
 
4
]
 
4
 · 5H
 
2
O
8.DC.15Arthurite
CuFe
3+
2
[(OH,O)|(AsO
 
4
,PO
 
4
,SO
 
4
)]
 
2
 · 4H
 
2
O
8.DC.15Ojuelaite
ZnFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
8.DC.15Whitmoreite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
8.DC.15Cobaltarthurite
(Co,Mg)Fe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
8.DC.15Bendadaite
Fe
2+
 
Fe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
8.DC.15Kunatite
CuFe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
·4H
 
2
O
8.DC.15UKI-2006-(PO:FeHZn)
ZnFe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
·4H
 
2
O
8.DC.15UKI-2006-(PO:AlCuFeH)
Fe
2+
 
Al
 
3
(PO
 
4
)
 
2
(OH)
 
2
·4H
 
2
O
8.DC.17Kleemanite
ZnAl
 
2
[OH|PO
 
4
]
 
2
 · 3H
 
2
O
8.DC.20Bermanite
Mn
2+
 
(H
 
2
O)
 
4
[Mn
3+
2
(OH)
 
2
(PO
 
4
)
 
2
]
8.DC.22Kovdorskite
Mg
 
2
(PO
 
4
)(OH)·3H
 
2
O
8.DC.25Ferristrunzite
Fe
3+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
8.DC.25Ferrostrunzite
Fe
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 6H
 
2
O
8.DC.25Metavauxite
Fe
2+
 
Al
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.25Strunzite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 6H
 
2
O
8.DC.27Beraunite
Fe
2+
 
Fe
3+
5
[(OH)
 
5
|(PO
 
4
)
 
4
] · 4H
 
2
O
8.DC.30Gordonite
MgAl
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Laueite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Mangangordonite
Mn
2+
 
Al
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Paravauxite
Fe
2+
 
Al
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Pseudolaueite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Sigloite
Fe
3+
 
Al
 
2
[(OH)
 
3
|(PO
 
4
)
 
2
] · 7H
 
2
O
8.DC.30Stewartite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Ushkovite
MgFe
3+
2
[PO
 
4
]
 
2
(OH)
 
2
 · 8H
 
2
O
8.DC.30Ferrolaueite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
 · 8H
 
2
O
8.DC.30Kastningite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
8.DC.30Maghrebite
MgAl
 
2
[OH|AsO
 
4
]
 
2
 · 8H
 
2
O
8.DC.32Tinticite
Fe
3+
5.34
(PO
 
4
)
 
3.62
(VO
 
4
)
 
0.38
(OH)
 
4
·6.7H
 
2
O
8.DC.35Vauxite
Fe
2+
 
Al
 
2
[OH|PO
 
4
]
 
2
 · 6H
 
2
O
8.DC.37Vantasselite
Al
 
4
[OH|PO
 
4
]
 
3
 · 9H
 
2
O
8.DC.40Cacoxenite
Fe
3+
24
Al[(OH)
 
12
|O
 
6
|(PO
 
4
)
 
17
] · 17H
 
2
O
8.DC.45Gormanite
(Fe
2+
 
,Mg)
 
3
(Al,Fe
3+
 
)
 
4
[(OH)
 
3
|(PO
 
4
)
 
2
]
 
2
 · 2H
 
2
O
8.DC.45Souzalite
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
4
[(OH)
 
3
|(PO
 
4
)
 
2
]
 
2
 · 2H
 
2
O
8.DC.47Kingite
Al
 
3
[(OH)
 
3
|(PO
 
4
)
 
2
] · 9H
 
2
O
8.DC.50Wavellite
Al
 
3
[(OH,F)
 
3
|(PO
 
4
)
 
2
] · 5H
 
2
O
8.DC.50Allanpringite
Fe
3+
3
[(OH)
 
3
|(PO
 
4
)
 
2
] · 5H
 
2
O
8.DC.52Kribergite
Al
 
5
[(OH)
 
4
|SO
 
4
|(PO
 
4
)
 
3
] · 4H
 
2
O
8.DC.55Mapimite
Zn
 
2
Fe
3+
3
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 10H
 
2
O
8.DC.57Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)[(OH)
 
3
|(AsO
 
4
)
 
2
]
 
2
 · 6H
 
2
O
8.DC.60Nevadaite
(Cu
2+
 
,Al,V
3+
 
)
 
6
Al
 
8
(PO
 
4
)
 
8
F
 
8
(OH)
 
2
(H
 
2
O)
 
22
8.DC.60Cloncurryite
(Cu,VO)Al
 
2
[(F,OH)|PO
 
4
]
 
2
 · 4.5-5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.12.1Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
19.12.2Bermanite
Mn
2+
 
(H
 
2
O)
 
4
[Mn
3+
2
(OH)
 
2
(PO
 
4
)
 
2
]
19.12.3Natrophilite
NaMn
2+
 
[PO
 
4
]
19.12.4Sidorenkite
Na
 
3
Mn
2+
 
[PO
 
4
|CO
 
3
]
19.12.5Niahite
(NH
 
4
)(Mn
2+
 
,Mg)[PO
 
4
] · H
 
2
O
19.12.6Robertsite
Ca
 
3
Mn
3+
4
[(OH)
 
3
|(PO
 
4
)
 
2
]
 
2
 · 3H
 
2
O
19.12.7Pararobertsite
Ca
 
2
Mn
3+
3
[O
 
2
|(PO
 
4
)
 
3
] · 3H
 
2
O
19.12.8Sinkankasite
H
 
2
Mn
2+
 
Al[OH|(PO
 
4
)
 
2
] · 6H
 
2
O
19.12.9Mangangordonite
Mn
2+
 
Al
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.12.10Heterosite
(Fe
3+
 
,Mn
3+
 
)[PO
 
4
]
19.12.11Purpurite
(Mn
3+
 
,Fe
3+
 
)[PO
 
4
]
19.12.12Wolfeite
(Fe
2+
 
,Mn
2+
 
)
 
2
[OH|PO
 
4
]
19.12.13Triploidite
(Mn
2+
 
,Fe
2+
 
)
 
2
[OH|PO
 
4
]
19.12.14Lipscombite
(Fe
2+
 
,Mn
2+
 
)Fe
3+
2
[OH|PO
 
4
]
 
2
19.12.15Frondelite
Mn
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
]
19.12.16Rockbridgeite
Fe
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
]
19.12.17Kryzhanovskite
MnFe
 
2
(PO
 
4
)
 
2
(OH)
 
2
·H
 
2
O
19.12.18Landesite
Mn
2+
3-x
Fe
3+
x
[(OH)
 
x
|(PO
 
4
)
 
2
] · (3-x)H
 
2
O
19.12.19Phosphoferrite
(Fe,Mn)
 
3
(PO
 
4
)
 
2
·3H
 
2
O
19.12.20Reddingite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·3H
 
2
O
19.12.22Hureaulite
(Mn,Fe)
 
5
(PO
 
3
OH)
 
2
(PO
 
4
)
 
2
·4H
 
2
O
19.12.23Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·7H
 
2
O
19.12.24Laueite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.12.25Pseudolaueite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.12.26Strunzite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 6H
 
2
O
19.12.27Stewartite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.12.28Alluaudite
(Na,Ca)Mn
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(PO
 
4
)
 
3
19.12.29Ferroalluaudite
(Na,Ca)Fe
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)
 
3
19.12.30Fillowite
{Mn
2+
 
}{Na
 
8
}{Ca
 
4
Na
 
4
}{(Mn
2+
 
,Fe
2+
 
)
 
43
}[PO
 
4
]
 
36
19.12.31Johnsomervilleite
{Ca}{Na
 
6
[ ]
 
2
}{Ca
 
6
Na
 
2
}{(Fe
2+
 
,Mg,Mn
2+
 
)
 
43
}[PO
 
4
]
 
36
19.12.32Wicksite
NaCa
 
2
(Fe
2+
 
,Mn
2+
 
)
 
4
MgFe
3+
 
[PO
 
4
]
 
6
 · 2H
 
2
O
19.12.33Dickinsonite-(KMnNa)
{KNa}{Mn
2+
 
[ ]}{Ca}{Na
 
3
}{Mn
2+
13
}{Al}[(OH)
 
2
|(PO
 
4
)
 
12
]
19.12.34Sarcopside
(Fe
2+
 
,Mn
2+
 
,Mg)
 
3
[PO
 
4
]
 
2
19.12.35Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
·4H
 
2
O
19.12.36Graftonite
(Fe
2+
 
,Mn
2+
 
,Ca)
 
3
[PO
 
4
]
 
2
19.12.37Wilhelmvierlingite
CaMnFe
3+
 
[OH|(PO
 
4
)
 
2
] · 2H
 
2
O
19.12.38Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
19.12.39Beusite
(Mn
2+
 
,Fe
2+
 
,Ca,Mg)
 
3
[PO
 
4
]
 
2
19.12.40Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
19.12.41Jahnsite-(CaMnFe)
CaMn
2+
 
Fe
2+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.42Jahnsite-(CaMnMn)
CaMn
2+
 
Mn
2+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.43Jahnsite-(CaMnMg)
CaMn
2+
 
(Mg,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.44Keckite
CaMnMn
2+
2
Fe
3+
3
(PO
 
4
)
 
4
(OH)
 
3
(H
 
2
O)
 
7
19.12.45Stanfieldite
Ca
 
7
Ca
 
2
Mg
 
9
[PO
 
4
]
 
12
19.12.46Laubmannite
(Fe
2+
 
,Mn
2+
 
,Ca)
 
3
Fe
3+
6
[(OH)
 
3
|PO
 
4
]
 
4
19.12.47Zodacite
Ca
 
4
Mn
2+
 
Fe
3+
4
[(OH)
 
2
|(PO
 
4
)
 
3
]
 
2
 · 12H
 
2
O
19.12.48Hagendorfite
NaCaMn
2+
 
Fe
2+
2
(PO
 
4
)
 
3
19.12.49Maghagendorfite
NaMn(Mg,Fe,Fe)
 
3
(PO
 
4
)
 
3
19.12.50Varulite
NaCaMn
2+
 
Mn
2+
2
(PO
 
4
)
 
3
19.12.51Griphite
Na
 
4
Li
 
2
Ca
 
6
(Mn
2+
 
,Fe
2+
 
,Mg)
 
19
Al
 
8
[(F,OH)|(PO
 
4
)
 
3
]
 
8
19.12.52Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
[(OH)
 
4
|(SiO
 
4
,PO
 
4
)|(HPO
 
4
,PO
 
4
)
 
3
]
19.12.53Arrojadite-(KFe)
{KNa}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
19.12.54Lun'okite
(Mn,Ca)(Mg,Fe,Mn)Al(PO
 
4
)
 
2
OH·4H
 
2
O
19.12.55Eosphorite
(Mn
2+
 
,Fe
2+
 
)Al[(OH)
 
2
|PO
 
4
] · H
 
2
O
19.12.56Ernstite
(Mn
2+
 
,Fe
3+
 
)Al[(OH,O)
 
2
|PO
 
4
] · H
 
2
O
19.12.57Childrenite
(Fe
2+
 
,Mn
2+
 
)Al[(OH)
 
2
|PO
 
4
] · H
 
2
O
19.12.58Bobfergusonite
Na
 
2
Mn
 
5
FeAl(PO
 
4
)
 
6
19.12.59Qingheiite
NaMn
3+
 
Mg(Al,Fe
3+
 
)[PO
 
4
]
 
3
19.12.60Whiteite-(CaFeMg)
Ca(Fe
2+
 
,Mn
2+
 
)Mg
 
2
Al
 
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.61Whiteite-(CaMnMg)
CaMn
2+
 
Mg
 
2
Al
 
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.62Whiteite-(MnFeMg)
(Mn
2+
 
,Ca)(Fe
2+
 
,Mn
2+
 
)Mg
 
2
Al
 
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.63Rittmannite
(Mn
2+
 
,Ca)Mn
2+
 
(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.64Zanazziite
Ca
 
2
(Mg,Fe)(Mg,Fe,Al)
 
4
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
19.12.65Samuelsonite
(Ca,Ba)Ca
 
8
Fe
2+
2
Mn
2+
2
Al
 
2
[(OH)
 
2
|(PO
 
4
)
 
10
]

Other Names for Earlshannonite

Synonyms:
IMA1983-010
Other Languages:
German:Earlshannonit
Spanish:Earlshannonita

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 Earlshannonite

Reference List:Peacor, D.R., Dunn, P.J., Simmons, W.B. (1984): "Earlshannonite, the Mn analogue of whitmoreite, from North Carolina", Canadian Mineralogist: 22: 471-474.

American Mineralogist: 70: 871-872.

Internet Links for Earlshannonite

Search Engines:
  • Look for Earlshannonite on Google
  • Look for Earlshannonite images on Google
    • External Links:
  • Look for Earlshannonite on Webmineral
  • Look for Earlshannonite on Athena Mineralogy
  • Look for Earlshannonite on Wikipedia
  • Look for Earlshannonite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Earlshannonite in the Natural History Museum (London) online catalogue
  • Earlshannonite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Find Earlshannonite on www.crystalclassics.co.uk
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Fabre Minerals - search for Earlshannonite specimens
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • rare and unusual minerals mainly crystallized
  • Buy RARE Minerals from Rocks of Africa
  • Search for - Earlshannonite - on e-Rocks Mineral Sales & Auctions
  • Buy Fine Minerals from mineralsweb.com
  • Top quality minerals from Kristalle of California
  • Wendel Minerals - Auktion & Shop
  • SpiriferMinerals.com - high quality specimens
  • Lapis Mineral Magazin
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Earlshannonite

    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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Horní Slavkov (Schlaggenwald)
          • Krásno
    		Sejkora, J., Škoda, R., Ondruš, P., Beran, P. & Susser, C. (2006): Mineralogy of phosphate accumulations in the Huber stock, Krásno ore district, Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 103-147.
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Žďár nad Sázavou
    		Staněk, J.: Parageneze minerálů pegmatitových žil z Hatí u Dolních Borů na západní Moravě. Acta Mus. Moraviae, Sci. nat., vol. 76, pages 19-49.
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Oberpfälzer Wald
          • Vohenstrauß
            • Waidhaus
              • Hagendorf
    		No reference listed
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Sowie Mts
    		Pieczka A., Łobos K., Sachanbiński M. 2004: The first occurence of elbaite in Poland. Mineralogia Polonica, vol. 35, 3-14
    USA
     
    • Maine
      • Oxford Co.
        • Greenwood
          • Uncle Tom Mt
    		No reference listed
        • Newry
    		King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed), 2000, Mineralogy of Maine, V. 2.
        • Paris
    • North Carolina
      • Cleveland Co.
        • Kings Mountain District
    		Peacor, D. R. et al (1984) Canadian Mineralogist: 22: 471-474.
      • Gaston Co.
        • Bessemer City
    		No reference listed
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    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: 19th Nov 2009 19:44:19