Tumblestones I

Idocrase

Also known as Vesuvianite
Oxide 6.5
Green, brown, yellow, pale blue, red
Kenya
Rare
Suitable to cleanse in water
Notes

Iron pyrite (Fools gold)
Sulfide 6
Pale brassy gold
Arizona, Colorado, New York, Missouri, Pennsylvania, South Carolina, and Tennessee, Worldwide
Common
Suitable to cleanse in water
Notes

Iolite Also known as Cordierite
(Shamanic stone)
Silicate 7.0
Blue, grey, violet, yellow
Madras India, Madagascar, Tanzania, South Africa
Suitable to cleanse in water
Do not use in elixirs toxic
Notes
Also known as water sapphire
Ocean Sapphire, Water Sapphire, Cordierite or Dichroite; some mineralogists now consider Iolite to be an obsolete name.

Iolite sunstone

Feldspar 6
India
Notes

Icelandic Spar pebbles Also known as Iceland Spar and clear calcite/optical calcite
Carbonates 3
Iceland, Mexico
Golden variety comes from Oklahoma USA
Common
Not suitable to cleanse in water
Notes

Infinite stone

Trade name for Green Serpentine
Silicate 2.5
Dark green to light green and many shades in between
South Africa
Power, Protection, Healing, Love
Not suitable to cleanse in water
Notes
Infinite is a trade name for a variety of green serpentine (mixture of Serpentine and Chrysotile) found in South Africa.