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Jade
| Chemical Formula | Na(Al,Fe)Si2O6 |
| Mohs Hardness | 6-7 |
| Specific gravity | 3.2～3.4 |
| Description | Jade is an ornamental rock. The term jade is applied to two different metamorphic rocks that are made up of different silicate minerals. Nephrite consists of a microcrystalline interlocking fibrous matrix of the calcium, magnesium-iron rich amphibole mineral series tremolite (calcium-magnesium) - ferroactinolite (calcium-magnesium-iron). The middle member of this series with an intermediate composition is called actinolite. The higher the iron content, the greener the colour. Jadeite is a sodium and aluminium rich pyroxene. The gem form of the mineral is a microcrystalline interlocking crystal matrix. In Japan, the earliest known jade artifacts excavated from prehistoric sites are simple ornaments with bead, button, and tubular shapes. Nephrite can be found in a creamy white form as well as in a variety of green colours, whereas jadeite shows more colour variations, including blue, lavender-mauve, pink, and emerald-green colours. |
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