Granitoid
A rock classification type
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About Granitoid
A granitoid is a coarse grained igneous rock composed mostly of quartz, K-feldspar (alkali-feldspar) and plagioclase), with 20-60% quartz on the QAPF diagram. It usually contains minor micas and/or amphiboles. Most commonly granite and granodiorite.
Unique Identifiers
Mindat ID:
48126
Long-form identifier:
mindat:1:1:48126:5
GUID
(UUID V4):
(UUID V4):
85224cbd-b218-498f-9a31-db8c51676af9
Classification of Granitoid
Rocks in sections 2 (alkali-feldspar granite), 3 (granite), 4 (granodiorite) and 5 (tonalite) on the QAPF diagram.
Section 3 can be divided into 3a (syenogranite) and 3b (monzogranite).
Sub-divisions of Granitoid
- Granitoid
- Alkali-feldspar-granite
- Granite
- Adamellite
- Fluorite granite
- Hypidiomorphic granite
- Lithian mica granite
- Muscovite granite
- Topaz granite
- Syenogranite
- Monzogranite
- Brecciated granite
- Muscovite-biotite granite
- Biotite granite
- Hornblende-biotite granite
- Aplitic granite
- Granophyric granite
- Porphyritic granite
- Leucogranite
- Charnockitic granite
- Melagranite
- Rapakivi granite
- Graphic granite
- Microgranite
- Pegmatitic granite
- Andengranite
- Hornblende granite
- Riebeckite granite
- Fluorine-rich granite
- Caucasite
- Elvan
- Engadinite
- Granodiorite
- Tonalite
- Greisen
- A-type granite
- I-type granite
- S-type granite
- C-type granite
- M-type granite
- Miarolite
Mineralogy of Granitoid
Essential minerals - these are minerals that are required within the classification of this rock:
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 |
| Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mica | A petrological term for Mica Group. |
Synonyms of Granitoid
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Granitoid associated with Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 1 photo of Granitoid associated with Amphibolite | |
| 1 photo of Granitoid associated with Paragneiss |
Internet Links for Granitoid
mindat.org URL:
https://www.mindat.org/min-48126.html
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References for Granitoid
Reference List:
D. João quarry, Monforte, Monforte, Portalegre, Portugal