Adakite
A rock subtype
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A term for a series of andesites, dacites and sodic rhyolites of unusual chemical composition erupted in some continent- based and island arc settings. They are characterized by high values of Sr, high Sr/Y and La/Yb ratios and negative Nb, Ti and Zr anomalies; the more mafic rocks of the series may contain high contents of transition metals such as Cr and Ni. They usually contain phenocrysts of plagioclase, amphibole, mica, very rare orthopyroxene, but no clinopyroxene; titanomagnetite, apatite, zircon and titanite are common.
Unique Identifiers
Mindat ID:
50629
Long-form identifier:
mindat:1:1:50629:0
GUID
(UUID V4):
(UUID V4):
7e5df104-412f-44b1-8ef8-4037b20dc8bf
Classification of Adakite
Mineralogy of Adakite
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole | (Na, K, â—»)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2 |
| Apatite | Ca5(PO4)3(Cl/F/OH) |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mica | A petrological term for Mica Group. |
| Pyroxene > Orthopyroxene | A petrological term for Orthopyroxene Subgroup. |
| Titanite | CaTi(SiO4)O |
| Titanomagnetite | A petrological term for Titanium-bearing Magnetite. |
| Zircon | Zr(SiO4) |
Internet Links for Adakite
mindat.org URL:
https://www.mindat.org/min-50629.html
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