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Andesine

Big Photo

Berry Ledge locality, Cornish, York Co., Maine, USA
© 2006 Peter Cristofono

Show Andesine Photos (7)
Formula:
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
System:TriclinicColour:White, grey, greenish, ...
Lustre:Sub-VitreousHardness:6 - 6½
A variety of Albite

A Plagioclase Feldspar with an Albite : Anorthite molar ratio ranging from 50 : 50 to 70 : 30.

Originally described from Marmato Mine, Marmato, Cauca, Chocó Department, Colombia.

Classification of Andesine

Strunz 8th edition ID:8/J.07-40
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 Andesine

Lustre:Sub-Vitreous
Diaphaneity (Transparency):Translucent on thin edges
Colour:White, grey, greenish, yellowish, etc.
Streak:White
Hardness (Mohs):6 - 6½
Cleavage:Perfect
Fracture:Step-Like

Crystallography of Andesine

Crystal System:Triclinic

Optical Data of Andesine

Type:Biaxial (+/-)
RI values: nα = 1.543 - 1.554 nβ = 1.547 - 1.559 nγ = 1.552 - 1.562
2V:Measured: 76° to 83°, Calculated: 78° to 84°
Maximum Birefringence:δ = 0.009

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Andesine

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

Relationship of Andesine to other Species

Related Minerals - Nickel-Strunz Grouping):
9.FA.IMA2007-049
NaAlSi
 
3
O
 
8
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.30Kokchetavite
KAlSi
 
3
O
 
8
9.FA.30Monalbite
Na[AlSi
 
3
O
 
8
]
9.FA.35Albite
Na[AlSi
 
3
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.35Oligoclase
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.35Reedmergnerite
Na[BSi
 
3
O
 
8
]
9.FA.35Lingunite
(Na,Ca)AlSi
 
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.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
Ca[BSiO
 
4
]
 
2
9.FA.65Maleevite
BaB
 
2
Si
 
2
O
 
8
9.FA.65Pekovite
SrB
 
2
Si
 
2
O
 
8

Other Names for Andesine

Synonyms:
Andesite (of Dana)
Russian names:
Андезин

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 Andesine

Reference List:Richet, P. and Bottinga, Y. (1984b) Anorthite, andesine, wollastonite, diopside, cordierite, and pyrope thermodynamics of melting, glass transitions, and properties of the amorphous phases. Earth and Planetary Science Letters: 67: 415-432.

Internet Links for Andesine

Search Engines:
  • Look for Andesine on Google
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    • External Links:
  • Andesine details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Buy Fine Minerals from mineralsweb.com
  • Find Andesine on www.crystalclassics.co.uk
  • Buy from David K Joyce minerals
  • Lapis Mineral Magazin
  • Buy Minerals and Crystals from Crystalarium.com
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  • The Arkenstone - Fine Minerals
  • e-Rocks - Mineral Auctions and Sales
  • Search for Andesine on minvision.com
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Wilensky Fine Minerals
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    Localities for Andesine

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