tephrite: meaning, definition, pronunciation and examples
C2 (Very Low Frequency)Technical/Scientific
Quick answer
What does “tephrite” mean?
A fine-grained, dark volcanic rock containing plagioclase, feldspathoid (nepheline or leucite), and pyroxene, with little to no olivine.
Audio
Pronunciation
Definition
Meaning and Definition
A fine-grained, dark volcanic rock containing plagioclase, feldspathoid (nepheline or leucite), and pyroxene, with little to no olivine.
In geology and volcanology, a type of extrusive igneous rock of the foid-bearing basalt clan, forming from relatively silica-undersaturated magma. Its composition is defined by the absence of primary quartz and the presence of specific feldspathoid minerals.
Dialectal Variation
British vs American Usage
Differences
No significant difference in definition or usage. Spelling and pronunciation are consistent.
Connotations
None beyond its technical meaning.
Frequency
Equally rare in both technical communities (geology, volcanology).
Grammar
How to Use “tephrite” in a Sentence
The [LOCATION] lava is classified as tephrite.Tephrite is characterized by the presence of [MINERAL].[SCIENTIST] identified the rock sample as tephrite.Vocabulary
Collocations
Examples
Examples of “tephrite” in a Sentence
adjective
British English
- The tephritic lava flows were mapped across the ancient caldera.
American English
- Tephritic magmas are common in certain rift valley settings.
Usage
Meaning in Context
Business
Not used.
Academic
Exclusively used in geological sciences, particularly in petrology, volcanology, and earth science publications.
Everyday
Virtually never used.
Technical
The primary context. Used to classify and describe specific volcanic rock samples in research, fieldwork, and laboratory reports.
Watch out
Common Mistakes When Using “tephrite”
- Confusing tephrite with basalt (basalt lacks feldspathoids).
- Confusing tephrite with tuff (tuff is fragmental, tephrite is crystalline).
- Mispronouncing as /ˈtiːfraɪt/ or /tɛˈfriːt/.
FAQ
Frequently Asked Questions
No. While both are dark, mafic volcanic rocks, basalt contains no feldspathoid minerals (like nepheline or leucite), whereas tephrite does. Tephrite is silica-undersaturated compared to basalt.
Tephrites are typically associated with intraplate volcanic settings, such as oceanic islands (e.g., some Canary Islands) and continental rift zones (e.g., the East African Rift, the Rhine Graben).
Usually not. Tephrite is typically fine-grained (aphanitic), requiring a microscope (thin section analysis) to accurately identify its constituent minerals like nepheline.
Both contain feldspathoids. The key difference is that basanite contains significant olivine, while tephrite contains little to no olivine. They are part of the same rock series.
A fine-grained, dark volcanic rock containing plagioclase, feldspathoid (nepheline or leucite), and pyroxene, with little to no olivine.
Tephrite is usually technical/scientific in register.
Tephrite: in British English it is pronounced /ˈtɛfrʌɪt/, and in American English it is pronounced /ˈtɛfˌraɪt/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'TEPH' from the Greek 'tephra' (ash) + 'RITE' (rock type). It's the 'ashy rock' that forms from volcanic ash and magma.
Conceptual Metaphor
N/A for highly technical terms.
Practice
Quiz
What is the key mineralogical feature distinguishing tephrite from ordinary basalt?