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Index (J)

JA - JC

JD - JF

JG - JJ

JK - JN

JO - JR

JS - JV

JW - JZ

Moment of truth
The Sun, with a diameter of 1,392,000 km, is made of 94% hydrogen atoms.


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jade Min.
A common name for mineral jadeite and rock-forming mineral nephrite. These are semiprecious stones for ormental purposed. First used in China but being brought to Europe and America. Jadeite, is a sodium aluminium pyroxene (NaAlSi2O6), is more valued than nephrite. The former consists of fine, interlocking crystals and prized for its brilliant emerald green (due to chromium), although other varieties such as green-white, and brown-orange (due to iron) can also occur. Nephrite is a variety of mineral actinolite, one of the amphibole group of rock-forming mineral.

Jade is very tough and is stronger than steel. Ancient civilization has used it to make axes, knives and other types of weaponry. It was (and still is) later become a symbolic stone for religious artifacts and ornamental purposes.

jarosite Min.
A rather rare mineral belongs to alunite group, with formula composition KFe3(SO4)22(OH)6 (potassium iron sulfate hydroxide). It is semi-transparent (can be translucent), amber-yellowish brown with yellow streaks and appear as tabular to flattened rhombohedral looking crystals. The mineral is formed due to weathering in arid areas. It was named, in 1852, after Barranco Jaroso in southern Spain.

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