Tholeiitic basalt
A rock subtype
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About Tholeiitic basalt
A variety of basalt, a fine grained, mafic igneous rock, which is saturated or slightly oversaturated in silica with respect to alkalis. A silica-oversaturated (quartz-normative) basalt, characterized by the presence of low-calcium pyroxenes (orthopyroxene and/or pigeonite) in addition to clinopyroxene and calcic plagioclase.
Olivine may be present in the rock, but neither olivine nor nepheline appear in the CIPW norm. With decreasing silica it grades into alkaline basalt.
Olivine may be present in the rock, but neither olivine nor nepheline appear in the CIPW norm. With decreasing silica it grades into alkaline basalt.
Unique Identifiers
Mindat ID:
48498
Long-form identifier:
mindat:1:1:48498:9
GUID
(UUID V4):
(UUID V4):
3da02e8d-69e2-4c40-bc42-ab4da761e4eb
Classification of Tholeiitic basalt
Tholeiitic basalt is found in field B in the TAS diagram.
Sub-divisions of Tholeiitic basalt
- Tholeiitic basalt
Mineralogy of Tholeiitic basalt
Essential minerals - these are minerals that are required within the classification of this rock:
| Calcic plagioclase | A petrological term for plagioclase series feldspars dominant in calcium. |
| Olivine | Commonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ... |
| Pyroxene | A petrological term for Pyroxene Group. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Pyroxene > Clinopyroxene > Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Pyroxene > Orthopyroxene > Enstatite | Mg2Si2O6 |
| Silica > Quartz | SiO2 |
Age distribution
Recorded ages:
Phanerozoic : 66.8 ± 0.3 Ma to 0 Ma - based on 12 recorded ages.
Synonyms of Tholeiitic basalt
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Tholeiitic basalt associated with Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| 4 photos of Tholeiitic basalt associated with Pyroxene Group | ADSi2O6 |
| 1 photo of Tholeiitic basalt associated with Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| 1 photo of Tholeiitic basalt associated with Quartz | SiO2 |
| 1 photo of Tholeiitic basalt associated with Basalt |
Internet Links for Tholeiitic basalt
mindat.org URL:
https://www.mindat.org/min-48498.html
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Please feel free to link to this page.
Search Engines:
Schaumberg, Tholey, Sankt Wendel, Saarland, Germany