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Alleghanyite

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Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

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Formula:
Mn
2+
5
[(OH)
 
2
|(SiO
 
4
)
 
2
]
System:MonoclinicColour:Greyish-pink
Hardness:5½


Humite Group .

Classification of Alleghanyite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/B.04-60
Nickel-Strunz 10th (pending) edition ID:9.AF.45

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th edition ID:52.3.2b.1

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Hey's CIM Ref.:14.17.4

14 : Silicates not Containing Aluminum
17 : Silicates of Mn
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Type Occurrence of Alleghanyite

Type Locality:Bald Knob Deposit (Primary Ore Body; Crouse Knob Deposit), Bald Knob, Sparta, Alleghany Co., North Carolina, USA
Year of Discovery:1932

Physical Properties of Alleghanyite

Colour:Greyish-pink
Hardness (Mohs):5½

Crystallography of Alleghanyite

Crystal System:Monoclinic
Cell Parameters:a = 8.27Å, b = 4.85Å, c = 10.72Å
β = 104.64°
Ratio:a:b:c = 1.705 : 1 : 2.21
Unit Cell Volume:V 416.01 ų (Calculated from Unit Cell)

Optical Data of Alleghanyite

Type:Biaxial (-)
RI values: nα = 1.756 nβ = 1.780 nγ = 1.792
2V:Measured: 72° , Calculated: 68°
Maximum Birefringence:δ = 0.036

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

Chemical Properties of Alleghanyite

Formula:
Mn
2+
5
[(OH)
 
2
|(SiO
 
4
)
 
2
]
Essential elements:H, Mn, O, Si
All elements listed in formula:H, Mn, O, Si
Common Impurities:Ti,Al,Fe,Mg,Ca,F

Relationship of Alleghanyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AF.05Sillimanite
Al
 
2
[O|SiO
 
4
]
9.AF.10Andalusite
Al
 
2
[O|SiO
 
4
]
9.AF.10Kanonaite
Mn
3+
 
Al[O|SiO
 
4
]
9.AF.15Kyanite
Al
 
2
[O|SiO
 
4
]
9.AF.20Mullite
Al
 
8
[(O,OH,F)|(Si,Al)O
 
4
]
 
4
9.AF.20Krieselite
(Al,Ga)
 
2
[(OH)
 
2
|GeO
 
4
]
9.AF.23Boromullite
Al
 
9
Si
 
2
BO
 
19
9.AF.25Yoderite
Mg(Al,Fe
3+
 
)
 
3
[O|OH|(SiO
 
4
)
 
2
]
9.AF.30Magnesiostaurolite
(Mg,Li,Fe
2+
 
)
 
1.5-2
Al
 
9
[O
 
6
|(OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.30Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
[O
 
6
|(OH,O)
 
2
|(SiO
 
4
)
 
4
]
9.AF.30Zincostaurolite
(Zn,Li,Fe
2+
 
,Mg)
 
<2
Al
 
9
[O
 
6
|(OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.35Topaz
Al
 
2
[(F,OH)
 
2
|SiO
 
4
]
9.AF.40Norbergite
Mg
 
3
[(F,OH)
 
2
|SiO
 
4
]
9.AF.45Chondrodite
(Mg,Fe
2+
 
)
 
5
[(F,OH)
 
2
|(SiO
 
4
)
 
2
]
9.AF.45Reinhardbraunsite
Ca
 
5
[(OH,F)
 
2
|(SiO
 
4
)
 
2
]
9.AF.45Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
9.AF.50Humite
(Mg,Fe
2+
 
)
 
7
[(F,OH)
 
2
|(SiO
 
4
)
 
3
]
9.AF.50Manganhumite
(Mn
2+
 
,Mg)
 
7
[(OH)
 
2
|(SiO
 
4
)
 
3
]
9.AF.50Unnamed (Ca-analogue of humite)
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.55Clinohumite
(Mg,Fe
2+
 
)
 
9
[(F,OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.55Sonolite
Mn
2+
9
[(OH,F)
 
2
|(SiO
 
4
)
 
4
]
9.AF.55Hydroxylclinohumite
Mg
 
9
[(OH,F)
 
2
|(SiO
 
4
)
 
4
]
9.AF.60Leucophoenicite
Mn
2+
7
[(OH)
 
2
|(SiO
 
4
)
 
3
]
9.AF.65Ribbeite
(Mn
2+
 
,Mg)
 
5
[(OH)
 
2
|(SiO
 
4
)
 
2
]
9.AF.70Jerrygibbsite
Mn
2+
9
[(OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.75Franciscanite
Mn
2+
6
(V
5+
 
,[])
 
2
[(O,OH)
 
3
|SiO
 
4
]
 
2
9.AF.75Örebroite
Mn
2+
3
(Fe
3+
 
,Sb
5+
 
)[(O,OH)
 
3
|SiO
 
4
]
9.AF.75Welinite
Mn
2+
6
(W
6+
 
,Mg)
 
2
[(O,OH)
 
3
|SiO
 
4
]
 
2
9.AF.80Ellenbergerite
Mg
 
6
Al
 
6
Ti[(OH)
 
6
|(HSiO
 
4
)
 
4
|(SiO
 
4
)
 
4
]
9.AF.85Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
9.AF.85Magnesiochloritoid
MgAl
 
2
[O|(OH)
 
2
|SiO
 
4
]
9.AF.85Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
9.AF.90Poldervaartite
CaCa[SiO
 
3
OH](OH)
9.AF.90Olmiite
CaMn
2+
 
[SiO
 
3
(OH)](OH)
Related Minerals - Hey's Index Grouping:

- +
14.17.1Rhodonite
MnSiO
 
3
14.17.2Tephroite
Mn
2+
2
[SiO
 
4
]
14.17.3Braunite
Mn
2+
 
Mn
3+
6
[O
 
8
|SiO
 
4
]
14.17.5Ribbeite
(Mn
2+
 
,Mg)
 
5
[(OH)
 
2
|(SiO
 
4
)
 
2
]
14.17.6Leucophoenicite
Mn
2+
7
[(OH)
 
2
|(SiO
 
4
)
 
3
]
14.17.7Jerrygibbsite
Mn
2+
9
[(OH)
 
2
|(SiO
 
4
)
 
4
]
14.17.8Bementite
Mn
 
5
Si
 
4
O
 
10
(OH)
 
6
14.17.9Parsettensite
K
 
1.2
Mn
 
8
(Si,Al)
 
12
O
 
26
(OH)
 
10
14.17.10Yofortierite
Mn
 
5
Si
 
8
O
 
20
(OH)
 
2
·8-9H
 
2
O

Other Names for Alleghanyite

Other Languages:
German:Alleghanyit
Russian:Аллеганит
Spanish:Alleghanyita

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 Alleghanyite

Reference List:American Mineralogist: 17: 1-15.

Zeitschrift für Kristallographie: 132: 1-18.

Internet Links for Alleghanyite

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    Localities for Alleghanyite

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