Entry № 332
Prehnite
Prehnite
Botryoidal green light with epidote needles inside.
Chakra
Heart · Solar Plexus
Element
Earth · Water
Zodiac
Libra · Virgo
I. The Metaphysical Reading
How the stone has been held.
Prehnite is long associated with intuition that can be trusted — often called a stone of quiet foresight. It is kept for decluttering, both of rooms and of obligations, and for practitioners who want their inner guidance to feel calm rather than urgent.
- Chakra
- Heart · Solar Plexus
- Element
- Earth · Water
- Zodiac
- Libra · Virgo
- Keynote
- Botryoidal green light with epidote needles inside.
II. The Scientific Reading
What the lattice actually does.
Prehnite is a calcium aluminium phyllosilicate that crystallises in the orthorhombic system, usually as botryoidal or reniform aggregates of tabular crystals lining basalt cavities. It is the index mineral of the prehnite–pumpellyite metamorphic facies, marking very low-grade metamorphism between diagenesis and greenschist conditions. Green colour is attributed to Fe³⁺ substituting for aluminium; specimens frequently host acicular epidote inclusions.
- Formula
- Ca₂Al₂Si₃O₁₀(OH)₂
- System
- Orthorhombic
- Hardness
- 6 – 6.5 (Mohs)
- Provenance
- South Africa, Australia, Mali, USA (New Jersey, Connecticut)
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- Ca₂Al₂Si₃O₁₀(OH)₂
- Crystal System
- Orthorhombic
- Mohs Hardness
- 6 – 6.5 (Mohs)
- Density
- 2.80 – 2.95 g/cm³
- Refractive Index
- 1.611 – 1.669
- Provenance
- South Africa, Australia, Mali, USA (New Jersey, Connecticut)
- Color Origin
- Apple green, yellow-green, grey, colourless
Related Crystals
Stones that share this lattice
Next in the Atlas
Preseli Bluestone
The stone that walked to Stonehenge.
