Mineral
Plural: Minerals
Mineral definition
- A mineral is a naturally occurring inorganic substance formed through geological processes, characterized by a specific chemical composition and an ordered internal crystal structure.
In art, chemistry, and material science, minerals are especially important because many traditional pigments, grounds, and painting materials originate from crushed or processed minerals.
Minerals are typically identified by characteristics such as:
- Chemical composition
- Crystal structure
- Hardness
- Color
- Luster
- Density
Many historic pigments derive directly from minerals, including:
- Lapis lazuli → ultramarine blue
- Malachite → green pigments
- Azurite → blue pigments
- Hematite → red and brown earth pigments
- Calcite → chalk and gesso components
Minerals differ from organic materials because they are not produced by living organisms, although some substances used in art may contain both mineral and organic components.
Examples
Natural ultramarine pigment was historically made from the mineral lapis lazuli. Many classical earth pigments are composed of iron-rich minerals. Artists and conservators study minerals to understand pigment stability and aging.
Context
The term mineral is widely used in geology, chemistry, conservation science, painting materials, and pigment production. In art history, minerals played a fundamental role in the development of traditional pigments and grounds used in frescoes, oil painting, manuscript illumination, and decorative arts.
Core Principles
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Minerals are naturally occurring inorganic substances.
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They possess a defined chemical composition and crystal structure.
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Many traditional pigments originate from mineral sources.
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Mineral-based pigments are often valued for permanence and lightfastness.
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The physical properties of minerals influence color, texture, and opacity in art materials.
Derivation
The word mineral derives from the Medieval Latin minerale, meaning “substance obtained from a mine,” which originates from mina (“mine”). The term evolved through Late Latin and Old French before entering English scientific vocabulary.