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Oligoclase

Big Photo

Chihuahua, Mexico
© Rob Lavinsky

Show Oligoclase Photos (23)
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

Related to:
  • 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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    • External Links:
  • Oligoclase details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • The Arkenstone - Fine Minerals
  • Search for Oligoclase at Thames Valley Minerals
  • SpiriferMinerals.com - high quality specimens
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Search for Oligoclase on minvision.com
  • Search for - Oligoclase - on e-Rocks Mineral Sales & Auctions
  • Buy fine minerals and gemstones from Pala International
  • rare and unusual minerals mainly crystallized
  • Lapis Mineral Magazin
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Fine Minerals from Dan Weinrich Minerals
  • Find Oligoclase on www.crystalclassics.co.uk
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    Localities for Oligoclase

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