About Prehnite

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Keep reading to discover more about prehnite

  • Mineralogy and geology*
  • Metaphysical, Spiritual and Healing** Properties***
  • Common Associations


Mineralogy and Geology of Prehnite

Mineral formula: Ca2Al2Si3O10(OH)2

Grouping: a member of the Prehnite Group

Crystal system: orthorhombic

Crystal habit: Uncommon crystals are blocky to thin tabular; aggregates are fanlike, reniform, globular, stalactitic, granular, compact.

Cleavage: good on {001}, poor on {110}

Fracture: irregular/uneven

Color: colorless, gray, yellow, yellow-green, or white

Luster: vitreous, pearly

Diaphaneity: translucent

Moh’s scale hardness: 6 – 6 ½

Streak: white

Specific gravity: 2.8 – 2.95

Named after: the Dutch Colonel, Hendrik von/van Prehn, who is credited with discovering the mineral in 1774 at the Cape of Good Hope in South Africa. 

Type locality:  Karoo dolerites, Cradock, Inxuba Yethemba Local Municipality, Chris Hani District Municipality, Eastern Cape, South Africa

Geological occurrence: A secondary mineral in mafic volcanic rocks, also a low-grade metamorphic mineral.


Spiritual, Metaphysical and Healing Properties

Prehnite is known for its ability to multiply energy and to enhance protective fields. It provides coherence to the energy of crystal grids. It is also known as a “stone for dreaming and remembering,” assisting with meditations and journeys, bringing in divine inspiration and knowing.

Common Associations

  • Chakra – depends on color – clear can related to any or all chakras, green relates to the heart chakra
  • Numerology - vibrates to the number 5
  • Planets – variable, depends on the type
  • Zodiac – Libra
  • Birthstone – no traditional associations
  • Wedding Anniversary – no traditional associations


* Mineralogical information is from mindat.org

** Always consult with your medical professional for any physical or long-term healing issues.

*** Metaphysical properties come from: 

Love Is in the Earth (1995) Melody, Earth-Love Publishing House, 726 pp.

The Crystal Bible, A Definitive Guide to Crystals (2003) Judy Hall, Walking Stick Press, 399 pp.

Crystal Muse (2017) Heather Askinosie and Timmi Jandro, Hay House, 285 pp.

Crystal Gridwork (2018) Kiera Fogg, Weiser Books, 128 pp.