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Oligoclase

Big Photo

Chihuahua, Mexico
© Rob Lavinsky

Show Oligoclase Photos (24)
Formula:
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
Colour:Colourless, whiteHardness:6 - 6½
A variety of Albite

A Plagioclase Feldspar with an Albite : Anorthite molar ratio ranging from 90 : 10 to 70 : 30.

Originally described from Danvikstull, Stockholm, Södermanland, Sweden.

Classification of Oligoclase

Strunz 8th edition ID:8/J.07-30
Nickel-Strunz 10th (pending) edition ID:9.FA.35

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
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Physical Properties of Oligoclase

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Colourless, white
Streak:White
Hardness (Mohs):6 - 6½
Cleavage:Perfect
Fracture:Step-Like

Chemical Properties of Oligoclase

Formula:
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
All elements listed in formula:Al, Ca, Na, O, Si

Relationship of Oligoclase to other Species

Member of Group:
Feldspar Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.FA.05Kaliophilite
K[AlSiO
 
4
]
9.FA.05Kalsilite
K[AlSiO
 
4
]
9.FA.05Nepheline
(Na,K)[AlSiO
 
4
]
9.FA.05Panunzite
(Na,K)[AlSiO
 
4
]
9.FA.05Trikalsilite
(Na,K)[AlSiO
 
4
]
9.FA.05Yoshiokaite
(Ca,Na)[Al(Al,Si)O
 
4
]
9.FA.05Megakalsilite
KAlSiO
 
4
9.FA.10Malinkoite
NaBSiO
 
4
9.FA.15Virgilite
LiAlSi
 
2
O
 
6
9.FA.25Lisitsynite
KBSi
 
2
O
 
6
9.FA.30Adularia
KAlSi
 
3
O
 
8
9.FA.30Anorthoclase
(Na,K)[AlSi
 
3
O
 
8
]
9.FA.30Buddingtonite
(NH
 
4
)[AlSi
 
3
O
 
8
]
9.FA.30Celsian
Ba[Al
 
2
Si
 
2
O
 
8
]
9.FA.30Hyalophane
(K,Ba)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.30Microcline
K[AlSi
 
3
O
 
8
]
9.FA.30Orthoclase
K[AlSi
 
3
O
 
8
]
9.FA.30Sanidine
K[AlSi
 
3
O
 
8
]
9.FA.30Rubicline
(Rb,K)[AlSi
 
3
O
 
8
]
9.FA.30Monalbite
Na[AlSi
 
3
O
 
8
]
9.FA.35Albite
Na[AlSi
 
3
O
 
8
]
9.FA.35Andesine
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.35Anorthite
Ca[Al
 
2
Si
 
2
O
 
8
]
9.FA.35Bytownite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
9.FA.35Labradorite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
9.FA.35Reedmergnerite
Na[BSi
 
3
O
 
8
]
9.FA.40Paracelsian
Ba[Al
 
2
Si
 
2
O
 
8
]
9.FA.45Svyatoslavite
Ca[Al
 
2
Si
 
2
O
 
8
]
9.FA.45Kumdykolite
NaAlSi
 
3
O
 
8
9.FA.50Slawsonite
(Sr,Ca)[Al
 
2
Si
 
2
O
 
8
]
9.FA.55Lisetite
CaNa
 
2
Al
 
4
Si
 
4
O
 
16
9.FA.60Banalsite
BaNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
9.FA.60Stronalsite
SrNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
9.FA.65Danburite
CaB
 
2
Si
 
2
O
 
8
9.FA.65Maleevite
BaB
 
2
Si
 
2
O
 
8
9.FA.65Pekovite
SrB
 
2
Si
 
2
O
 
8
9.FA.70Lingunite
(Na,Ca)AlSi
 
3
O
 
8
9.FA.75Kokchetavite
KAlSi
 
3
O
 
8

Other Names for Oligoclase

Synonyms:
Adventurine OligoclaseAmansiteAmanticeAmantiteAmausite
LluviaOligoalbiteOligoclasiteSoda-Spodumene (of Dana)Sodium Spodumene
Tschermakite (of Kobell)
Other Languages:
German:Amansit
Amantit
Amausit
Luotolit
Oligoklas
Oligoklasit
Spanish:Amansita
Amantita
Amausita
Oligoclasita
Varieties:
Lazur-FeldspathOligoclase-AlbiteOregon SunstoneSunstone

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 Oligoclase

Reference List:American Mineralogist (1968): 53: 1709-1723.

Zeitschrift für Kristallographie (1971): 133: 43.

Internet Links for Oligoclase

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    Localities for Oligoclase

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