Prehnite (Botryoidal) identification and geology

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• Smithsonite
• Hemimorphite

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner

GeoMiner

Last updated

2026-02-10T20:29:50.275794+00:00

Review status

Published; not independently peer-reviewed

• IMA–CNMNC List of Mineral Names — International Mineralogical Association. Official mineral-name, nomenclature, and classification records.
• Mineral ID Key — Mineralogical Society of America. Physical-property identification methods, repeat-testing guidance, and limitations.

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Common questions

What is Prehnite Botryoidal?

Botryoidal habit of prehnite forming grape-like rounded masses. Distinctive pale green collector specimens.

How can you identify Prehnite Botryoidal?

Compare several properties rather than relying on colour alone. This entry records colour: Pale green, yellow-green; lustre: Vitreous to waxy; streak: White; Mohs hardness: 6-6.5; cleavage: Good in one direction; crystal system: Orthorhombic; transparency: Translucent. Confirm an important identification with additional field tests or qualified laboratory work.

How does Prehnite Botryoidal form?

Forms botryoidal masses in basalt cavities from late-stage hydrothermal fluids rich in calcium and aluminum.

Where is Prehnite Botryoidal commonly found?

South Africa, New Jersey USA , Australia; found in basalt vesicles.

What is Prehnite Botryoidal commonly confused with?

Prehnite Botryoidal may be confused with Jade, Smithsonite, Hemimorphite. Compare multiple diagnostic properties because colour and surface appearance can overlap.