The following description of prehnite's metaphysical properties comes from Philip Permutt's "The Crystal Healer", page 52. Epidote's description, from the same book on page 45, follows. At the end, measurements for each of these crystals can be found.
"Prehnite
Common Source: Australia
Astrological Association: Libra
Chakra(s): Heart, Brow
Healing Qualities: Good for divination, prophecy, visualization, inspiration, and flow.
Emotional/Spiritual: Good for meditation, calmness, letting go, and finding your own true spiritual path through life. Helps agitation, dreams, and dream recall."
"Epidote
Common Sources: Brazil, Pakistan
Astrological Association: Gemini
Chakra: Brow
Healing Qualities: Good for perception and awareness."
Crystal A
Height: 0.8in
Width: 1.5in
Depth: 1.25in
Weight: 24.8g
Crystal B
Height: 0.9in
Width: 2in
Depth: 1.4in
Weight: 38.05g
Crystal C
Height: 1.5in
Width: 1.7in
Depth: 1.4in
Weight: 51.7g
Crystal D
Height: 1.3in
Width: 2in
Depth: 1.6in
Weight: 54.3g
Crystal E
Height: 1in
Width: 2in
Depth: 1.8in
Weight: 69.2g
Crystal F
Height: 1.2in
Width: 2.5in
Depth: 2in
Weight: 109.2g
Crystal G
Height: 1.3in
Width: 3in
Depth: 2in
Weight: 114.7g
Crystal H
Height: 1.2in
Width: 2.3in
Depth: 2.3in
Weight: 113.4g
