Is crystalline graphite natural or artificial graphite?

Crystalline graphite (or flake graphite) is essentially natural graphite, referring to graphite minerals found in nature that possess a well-

developed crystal structure and visible crystal forms; man-made materials are typically referred to as "artificial graphite" or "synthetic

 graphite" and are generally not simply called "crystalline graphite."

Core Definitions

**Crystalline Graphite = Natural Crystalline Graphite:** Formed through geological processes with an ordered crystal arrangement (e.g.,

 flake or lump/dense crystalline forms); classified as a natural non-metallic mineral.

**Artificial Graphite:** Produced from raw materials such as petroleum coke via high-temperature graphitization. Although it possesses

 a graphite crystal structure, it is termed "artificial graphite" in the industry; its degree of crystallinity is generally lower than that of

 natural flake graphite.

Main Forms of Natural Crystalline Graphite

**Flake Graphite:** Crystals appear as fish-like scales (hexagonal crystal system); it offers the best lubricity and plasticity, as well as the

 highest industrial value.

**Dense Crystalline Graphite (Lump Graphite):** Crystals are visible to the naked eye and arranged haphazardly in lumps; it has a high

 grade (carbon content of 60%–98%) but lacks the lubricity of flake graphite.

*Note: Cryptocrystalline graphite (amorphous/earthy graphite) consists of extremely fine crystals (<1 μm) requiring electron

 microscopy for observation; it is sometimes classified separately and does not fall under the category of graphite with "distinct

 crystallinity."