Junitoite
A variety of Minerals
What is Junitoite?
Junitoite is a mineral with formula CaZn2Si2O7·H2O. It was discovered at the Christmas mine in Christmas, Arizona, and described in 1976. The mineral is named for mineral chemist Jun Ito (1926–1978).
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Key Characteristics
Composition of Junitoite
In 1968, Jun Ito published the results of synthesis of various lead calcium zinc silicates. The formula of one phase, designated X3, was identified as probably CaZnSi2O6·H2O. When he described junitoite, Sidney Williams identified the mineral's formula as CaZn2Si2O7·H2O, based on communications with Ito. The mineral's crystal structure was first determined in 1985 and refined in 2012. The mineral crystallizes in the orthorhombic crystal system. The structure is formed by chains of corner-sharing ZnO4 tetrahedra linked together by Si2O7 tetrahedral pairs. Calcium ions occupy vacancies and coordinate to five oxygen atoms and one water molecule.
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Quick Facts
Physical Properties
- Color
- colorless
- Hardness (Mohs)
- 4.5
- Density
- 3.5 g/cm³
- Streak
- Colorless
Chemical Properties
- Chemical Formula
- CaZn2Si2O7 · H2O
- Elements
- Ca, H, O, Si, Zn
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