Here are 13 Earth science words that start with X, from “X-ray computed tomography” to “Xonotlite”. These entries include imaging techniques, mineral names, and process terms used across geology and environmental science.
Earth science words that start with X are specialized terms used in geology, mineralogy, and environmental studies. Many derive from Greek roots or place names; xonotlite, for example, is named after Xonotla, Mexico.
Below you’ll find the table with [COLUMN_NAMES].
Term: The word or phrase listed; use it to find the specific entry you want.
Definition: A concise 1–2 sentence meaning; read this to understand the term quickly and accurately.
Category: The field or subdiscipline (for example, mineralogy or climatology) so you can sort terms by use.
Example: A short example or context sentence showing how the term appears in Earth science writing.
More info: A link or citation to an extended article where you can explore the term in depth.
Earth science words that start with X
| Term | Field | Related terms | Typical units/scale | Description |
|---|---|---|---|---|
| Xenolith | Geology | Country rock inclusion, enclave | meters to kilometers | A fragment of older rock engulfed by magma and preserved as an inclusion, often used to study deep crustal composition. |
| Xenocryst | Petrology | Foreign crystal, phenocryst | millimeters to centimeters | A crystal in an igneous rock that did not form from the host melt but was incorporated from surrounding rock. |
| Xenoblastic | Petrology | Texture, metamorphic texture | grain scale, micrometers to millimeters | Describes a rock texture with irregular mineral grains formed by recrystallization, common in metamorphic rocks. |
| Xenotime | Mineralogy | Yttrium phosphate, rare earth mineral | millimeters, grams per sample | A rare earth phosphate mineral (yttrium dominant) used for geochronology and tracing geological processes. |
| Xonotlite | Mineralogy | Calcium silicate, skarn mineral | millimeters, grams per sample | A calcium silicate mineral found in hydrothermal and metamorphic settings, commonly in skarns and refractory materials. |
| Xenon | Geochemistry/Atmospheric science | Noble gas, isotopes, 129Xe | parts per billion, trace gas | A noble gas present as a trace atmospheric and mantle component; its isotopes help study atmosphere evolution and geochemical processes. |
| X-ray diffraction | Mineralogy/Instrumentation | XRD, crystallography | angstroms (Å), lab scale | A laboratory method using X-rays to determine mineral crystal structures and identify phases in rocks and soils. |
| X-ray fluorescence | Geochemistry/Instrumentation | XRF, elemental analysis | parts per million to percent, lab/field | A technique that measures characteristic X-rays emitted by elements to quantify elemental composition of rocks, soils, and sediments. |
| X-ray computed tomography | Geoscience instrumentation | X-ray CT, micro-CT | millimeters to micrometers, lab samples | Non-destructive 3D imaging with X-rays to reveal internal structure of rocks, fossils, sediments, and cores. |
| Xeric | Climatology/Soil science | Arid, dry, desert | millimeters per year precipitation, regional scale | Describes dry environments or climates with low moisture availability, commonly used in soil classification and ecology. |
| Xerophyte | Ecology/Soil science | Drought-tolerant plant, succulent | N/A, organism scale | A plant adapted to survive in very dry conditions, often indicating xeric climates or soils. |
| Xerarch | Ecology | Xerarch succession, primary succession | years to centuries, local scale | Ecological succession that begins on dry substrates, such as rock or sand, leading to communities adapted to aridity. |
| Xenophyophore | Oceanography/Biological oceanography | Deep-sea protozoan, megafauna | centimeters to meters, deep sea | Large single-celled organisms found on abyssal plains that shape sediments and provide habitats for other deep-sea life. |