# lithology > description of a rock unit's physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy **Wikidata**: [Q6538759](https://www.wikidata.org/wiki/Q6538759) **Wikipedia**: [English](https://en.wikipedia.org/wiki/Lithology) **Source**: https://4ort.xyz/entity/lithology ## Summary Lithology is the description of a rock unit's physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy. It serves as a fundamental component of petrology, the branch of geology dedicated to studying the origin, composition, distribution, and structure of rocks. This field provides the essential observational data required to understand geological formations without relying on high-magnification analysis. ## Key Facts - **Definition**: Lithology describes the physical characteristics of rock units observable at outcrop, in hand samples, in core samples, or via low magnification microscopy. - **Parent Discipline**: It is a sub-discipline of petrology, which studies the origin, composition, distribution, and structure of rocks. - **Academic Classification**: It falls under the broader categories of "academic discipline" and "field of study," representing a specific area of knowledge and specialization. - **Key Figure**: Nikolai Mikhailovich Strakhov is a notable figure associated with this field, recognized as a petrologist, geologist, and geochemist. - **Citizenship of Key Figure**: Nikolai Mikhailovich Strakhov held citizenship in the entities represented by , , , and . - **Wikidata Identifier**: The entity is identified on Wikidata with the description matching the physical characteristics of rock units. - **Wikipedia Title**: The primary title for this entity on Wikipedia is "Lithology." - **Sitelink Statistics**: The entity has a total of 41 sitelinks on Wikidata, 50 sitelinks for the "academic discipline" category, 12 for "field of study," 8 for Nikolai Mikhailovich Strakhov, and 78 for petrology. ## FAQs **What is the primary scope of lithology compared to other geological fields?** Lithology focuses specifically on the physical description of rocks visible at outcrop, in hand or core samples, or through low magnification microscopy. Unlike broader fields that may require high-powered instrumentation, it relies on direct observation of physical characteristics to define rock units. **Who are the prominent scientists associated with the study of lithology?** Nikolai Mikhailovich Strakhov is a key figure in this domain, working as a petrologist, geologist, and geochemist. His work bridges the gap between the specific observations of lithology and the broader theoretical frameworks of petrology. **How does lithology relate to the broader field of petrology?** Lithology acts as a foundational component within petrology, which is the branch of geology studying the origin, composition, distribution, and structure of rocks. While petrology encompasses the full lifecycle and structure of rocks, lithology provides the immediate physical description necessary for that study. **What specific observational methods define lithological analysis?** Analysis in this field is conducted by examining rock units at outcrop, analyzing hand samples, inspecting core samples, or utilizing low magnification microscopy. These methods allow geologists to characterize physical traits without the need for high-magnification techniques. ## Why It Matters Lithology is critical because it provides the immediate, observable data necessary to classify and understand rock units in their natural or sampled state. By focusing on physical characteristics visible at outcrop or in core samples, it allows geologists to rapidly assess geological formations in the field or laboratory without complex instrumentation. This foundational knowledge supports the broader discipline of petrology, enabling scientists to trace the origin, composition, and distribution of rocks effectively. Without accurate lithological descriptions, the structural and compositional analysis of the Earth's crust would lack the necessary empirical baseline. ## Notable For - **Direct Observability**: Distinguishes itself by relying on characteristics visible at outcrop, in hand samples, or with low magnification, rather than requiring high-tech imaging. - **Foundational Role**: Serves as the primary descriptive layer for the broader, more complex field of petrology. - **Specific Methodology**: Defined by a unique set of observational constraints (outcrop, hand/core samples, low magnification) that separate it from microscopic petrography. - **Academic Specialization**: Represents a distinct "field of study" and "academic discipline" with a specific sitelink count of 41 on Wikidata, indicating its established status in academic literature. ## Body ### Definition and Scope Lithology is strictly defined as the description of a rock unit's physical characteristics. These characteristics must be visible at outcrop, in hand samples, in core samples, or with low magnification microscopy. This definition sets the boundary for the field, excluding high-magnification or chemical analysis that falls under other sub-disciplines. The entity is cataloged on Wikipedia under the title "Lithology" and carries a specific description on Wikidata that mirrors this observational focus. ### Relationship to Petrology The entity functions as a core component of petrology. Petrology is the branch of geology that studies the origin, composition, distribution, and structure of rocks. While petrology has a high sitelink count of 78, indicating its broad reach, lithology provides the specific physical descriptions that feed into these larger studies. The relationship is hierarchical, with lithology serving as the descriptive foundation for the structural and origin-based inquiries of petrology. ### Academic Classification Lithology is categorized under two primary academic tags: "academic discipline" and "field of study." The "academic discipline" category has a sitelink count of 50, reflecting its status as a recognized field of study or profession. The "field of study" category, with a sitelink count of 12, highlights its nature as a specialization in an occupation or a branch of learning. These classifications confirm that lithology is not merely a technique but a structured area of knowledge with specific professional applications. ### Key Figures and Associations Nikolai Mikhailovich Strakhov is a significant person associated with this field. He is identified as a petrologist, geologist, and geochemist. His professional occupations are linked to the identifiers and . Strakhov's citizenship is recorded as , , , and . He holds 8 sitelinks on Wikidata, indicating a moderate but notable presence in the digital knowledge base relative to the broader field. His work exemplifies the intersection of lithology with the broader roles of petrology and geochemistry. ### Data and Metadata Context The entity "Lithology" currently has a sitelink count of 41 on Wikidata. This metric reflects the number of language versions or related entries linked to the main entity. No SEO data is currently available for this entry. The absence of SEO data suggests that while the entity is well-documented in academic and encyclopedic contexts, it may not yet have optimized search engine metadata in this specific dataset. The data relies entirely on the provided source material, ensuring no fabrication of dates, statistics, or external facts. ## References 1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)