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Andesine

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Formula:
(Na,Ca)[Al(Si,Al)Si2O8]
System:
Triclinic
Colour:
White, gray, green, ...
Lustre:
Sub-Vitreous, Pearly
Hardness:
6 - 6½
Member of:
Name:
For the Andes Mountains of South America where it is abundant in the lavas.
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.
Crystals rare, to 2 cm; commonly massive, cleavable, or granular. Twinning: Commonly twinned after Albite, Pericline, and Carlsbad laws. Also twinned after a law similar to the Manebach law.

Visit gemdat.org for gemological information about Andesine.


Classification of Andesine

9.FA.35

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

Physical Properties of Andesine

Sub-Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
White, gray, green, yellow, flesh-red.
Streak:
White
Hardness (Mohs):
6 - 6½
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}, less perfect on {010}; {110} also observed.
Fracture:
Irregular/Uneven, Conchoidal

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°
Max Birefringence:
δ = 0.009
Image 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)Si2O8]
Elements listed in formula:

Crystallography of Andesine

Crystal System:
Triclinic

Occurrences of Andesine

First Recorded Occurrence of Andesine

Relationship of Andesine to other Species

Member of:
Other Members of Group:
AlbiteNa(AlSi3O8)
AmazoniteK(AlSi3O8)
AnorthiteCa(Al2Si2O8)
Anorthoclase(Na,K)AlSi3O8
BanalsiteNa2BaAl4Si4O16
Buddingtonite(NH4)(AlSi3)O8
Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
CelsianBa(Al2Si2O8)
DmisteinbergiteCa(Al2Si2O8)
FilatoviteK(Al,Zn)2(As,Si)2O8
HexacelsianBaAl2Si2O8
Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
KokchetaviteK(AlSi3O8)
KumdykoliteNa(AlSi3O8)
Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
MicroclineK(AlSi3O8)
Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
OrthoclaseK(AlSi3O8)
ParacelsianBa(Al2Si2O8)
ReedmergneriteNaBSi3O8
RubiclineRb(AlSi3O8)
SanidineK(AlSi3O8)
SlawsoniteSr(Al2Si2O8)
StronalsiteNa2SrAl4Si4O16
SunstoneA variety of feldspar (microcline or oligoclase) that has schiller, commonly with an orange/brown background color, ...
SvyatoslaviteCa(Al2Si2O8)
9.FA.05KaliophiliteKAlSiO4
9.FA.05KalsiliteKAlSiO4
9.FA.05NephelineNaAlSiO4
9.FA.05PanunziteK3Na(AlSiO4)4
9.FA.05TrikalsiliteK2NaAl3(SiO4)3
9.FA.05YoshiokaiteCa1-x(Al,Si)2O4
9.FA.05MegakalsiliteKAlSiO4
9.FA.10MalinkoiteNaBSiO4
9.FA.15VirgiliteLiAlSi2O6
9.FA.25LisitsyniteKBSi2O6
9.FA.30AdulariaKAlSi3O8
9.FA.30Anorthoclase(Na,K)AlSi3O8
9.FA.30Buddingtonite(NH4)AlSi3O8
9.FA.30CelsianBaAl2Si2O8
9.FA.30Hyalophane(K,Ba)(Al,Si)4O8
9.FA.30MicroclineKAlSi3O8
9.FA.30OrthoclaseKAlSi3O8
9.FA.30SanidineKAlSi3O8
9.FA.30RubiclineRbAlSi3O8
9.FA.30MonalbiteNaAlSi3O8
9.FA.35AlbiteNaAlSi3O8
9.FA.35AnorthiteCaAl2Si2O8
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8
9.FA.40ParacelsianBaAl2Si2O8
9.FA.45SvyatoslaviteCaAl2Si2O8
9.FA.45KumdykoliteNaAlSi3O8
9.FA.50SlawsoniteSrAl2Si2O8
9.FA.55LisetiteNa2CaAl4(SiO4)4
9.FA.60BanalsiteNa2BaAl4Si4O16
9.FA.60StronalsiteNa2SrAl4Si4O16
9.FA.65DanburiteCaB2Si2O8
9.FA.65MaleeviteBaB2Si2O8
9.FA.65PekoviteSrB2Si2O8
9.FA.70LinguniteNaAlSi3O8
9.FA.75KokchetaviteKAlSi3O8

Other Names for Andesine

Name in Other Languages:
German:Andesin
Simplified Chinese:中性长石
中长石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Andesine in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Andesine

Reference List:
Richet, P., Bottinga, Y. (1984) 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

mindat.org URL:
https://www.mindat.org/min-220.html
Please feel free to link to this page.
Specimens:
The following Andesine specimens are currently listed for sale on minfind.com.

Localities for Andesine

Mineral and/or Locality  
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