Rainbow Moonstone Geology A variation of Orthoclase, Moonstone is a sodium potassium aluminium silicate. Moonstone has been used in jewellery for centuries, including ancient civilizations. The Romans admired moonstone as they believed it was born from solidified rays of the moon. Both the Romans & Greeks associated Moonstone with their lunar deities. The most common moonstone is of the mineral adularia. The plagioclase feldspar oligoclase also produces moonstone specimens. Moonstone is feldspar with a pearly & opalescent luster. An alternative name is hecatolite. Moonstone is composed of two feldspar species, orthoclase & albite. The two species are intermingled. Then, as the newly formed mineral cools, the intergrowth of orthoclase & albite separates into stacked, alternating layers. When light falls between these thin flat layers, it scatters in many directions producing the phenomenon called adularescence. Deposits of moonstone occur in Australia, the Austrian Alps, Mexico, Madagascar, Burma, Norway, Poland, India, Sri Lanka and the United States. Currently the state gem for Florida Metaphysical Properties Holds pure & divine Goddess energy. Excellent meditation & manifestation stone. Place under pillow to aid lucid dreams and calm sleep. Opens crown Chakra connecting you with spirit guides & higher self. It is gentle yet strong & offers strength while teaching fearlessness. Also helps to improve learning difficulties in young children & protects homes. Crystal Healing Assist with hormones, fertility, thyroid, womb, after breast operations. Mineralogy Group: Feldspar (Silicates/ Tectosilicates) Crystal System: Monoclinic Composition: (Na,K)AlSi3O8. Form/Habit: Short Prismatic Hardness: 6-6.5 Cleavage: Perfect Fracture: Subchonchoidal to uneven, brittle Lustre: Vitreous Streak: White Specific Gravity: 2.5-2.6 Transparency: Transparent to translucent R.I: 1.51-1.54 Colour: Colourless, white, cream,yellow, pink, brown-red