Allotriomorphism
Definition
A property, state, or structural phenomenon characteristic of certain minerals or igneous rocks, consisting of the development of crystals lacking their own geometric faces or a native regular outer shape. This mineralogical process occurs when crystal growth is mechanically constrained and limited by the remaining free spaces between other mineral components solidified previously within the mass of the same magmatic melt.
Bilingual Equivalents
- Allotriomorphism
- Anhedralism
Grammatical & Source Details
| Inflection Type | Neuter/masculine abstract noun, following standard morphosyntactic configurations for plural and case structural shifts. |
| Formation | Derived using the specialized conceptual suffix '-ism' added to the root component, matching international petrographic semantics. |
| Spelling / Pronunciation | [æ.lɒ.tri.oʊ.ˈmɔːr.fɪz.əm] |
| Source | International Mineralogical Association Classification Guide and Igneous Petrology Handbook |
Contextual Usage Examples
RO: Acest alotriomorfism accentuat al cuarțului din structura granitului dovedește că el a fost ultimul mineral consolidat din topitură.
EN: This pronounced allotriomorphism of quartz within the granite structure proves that it was the last mineral to consolidate from the melt.
RO: Studiul petrografic a evidențiat un fenomen de alotriomorfism structural declanșat de răcirea bruscă a lavei vulcanice în mediu acvatic.
EN: The petrographic study highlighted a structural allotriomorphism phenomenon triggered by the sudden cooling of volcanic lava in an aquatic environment.
RO: Analiza secțiunilor subțiri la microscop permite măsurarea gradului de alotriomorfism pentru a stabili istoria termică a rocii.
EN: Analyzing thin sections under the microscope allows measuring the degree of allotriomorphism to establish the thermal history of the rock.
Idioms & Phrases
Alotriomorfism structural / Structural allotriomorphism
RO: Configurație texturală a unei roci în care granulele minerale își întrepătrund marginile neregulate din cauza lipsei spațiului de creștere.
EN: A textural configuration of a rock where mineral grains interlock their irregular margins due to the lack of growth space.
Alotriomorfism magmatic / Magmatic allotriomorphism
RO: Proces de cristalizare constrânsă specific rocilor plutonice adânci, unde fazele târzii sunt forțate să ocupe interstiții geometrice neregulate.
EN: A constrained crystallization process specific to deep plutonic rocks, where late phases are forced to occupy irregular geometric interstices.
Grad de alotriomorfism / Degree of allotriomorphism
RO: Indicator petrografic cantitativ utilizat pentru a evalua proporția de minerale anhedrale dintr-un eșantion de gresie ori magmatit.
EN: A quantitative petrographic indicator used to evaluate the proportion of anhedral minerals within a sandstone or magmatite sample.
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