Leucotonalite
A rock subtype
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A variety of tonalite with an M' colour index of less than 10, ie <10 vol.% mafic minerals. Depending on the mafic content the trondhjemite field ranges from:
18-60% quartz
36-80% plagioclase (generally more calcic than oligoclase)
<10% K feldspar or albite (usually the latter)
<10% mafic minerals (amphiboles, pyroxenes, biotite)
18-60% quartz
36-80% plagioclase (generally more calcic than oligoclase)
<10% K feldspar or albite (usually the latter)
<10% mafic minerals (amphiboles, pyroxenes, biotite)
Unique Identifiers
Mindat ID:
48174
Long-form identifier:
mindat:1:1:48174:2
GUID
(UUID V4):
(UUID V4):
0c1ac652-25fb-4032-b75c-1e0d855237af
Classification of Leucotonalite
Tonalite is in section 5 of the QAPF diagram.
Sub-divisions of Leucotonalite
- Leucotonalite
Mineralogy of Leucotonalite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Silica > Quartz | SiO2 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole | (Na, K, ◻)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2 |
Internet Links for Leucotonalite
mindat.org URL:
https://www.mindat.org/min-48174.html
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