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Free KREATEUR reference library

Crystal Library

A free, beginner-friendly reference for 100 stones. Explore their mineral identity, lookalikes, origins, care, and symbolic traditions, with illustrated profiles and credited sources.

Browse the complete index
KREATEUR The Crystal Encyclopedia A free field reference

Explore the illustrated profiles. Choose a stone to turn the page.

Quartz and quartz varieties

Crystalline quartz, color varieties, inclusion groups, and market-recognized quartz forms.

Chalcedony and agate

Microcrystalline quartz materials, including banded, included, and color-based trade varieties.

Jasper and patterned stones

Opaque silica-rich stones and patterned trade materials that require careful name and geology distinctions.

Feldspars and optical stones

Feldspars, volcanic glass, and related materials recognized by flashes, sheen, banding, or other optical effects.

Soft and colorful minerals

Visually distinctive minerals that often require additional care because of softness, cleavage, solubility, or treatment.

Blue and green gem materials

Blue and green gems, carving materials, and trade categories with important identity, treatment, and origin boundaries.

Jewelry and collector gems

Gem and collector materials for which treatment, synthesis, origin, and professional testing can strongly affect value.

Unusual and manufactured materials

Distinctive natural materials, mineraloids, and human-made products whose honest identity is central to description.