- Origin: Brazil
- Size: 60cm x 20 cm
- Weight: 7 Kg
- Description: Beautiful pyramid lamp composed of unique natural agate slices creating distinctive shades. Possibility to regulate light according to wishes (warm or cold).
- Additional information:
- Agate, common semiprecious silica mineral, a variety of chalcedony that occurs in bands of varying colour and transparency. Agate is essentially quartz, and its physical properties are in general those of that mineral.
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Most agates occur in cavities in eruptive rocks or ancient lavas. These agates have a banded structure, successive layers being approximately parallel to the sides of the cavity. It is probable that they have been formed as follows. During cooling of the lava, steam and other gases form bubbles. The bubbles overtaken by solidification are frozen in, forming cavities. Long after the rock has solidified, water—carrying silica in solution, probably as alkali silicate—penetrates into the bubble and coagulates to a silica gel. Soluble components of the iron-bearing rock diffuse into the silica gel and produce the regular layers of iron hydroxide. Finally the whole mass gradually hardens with loss of water and crystallization of much of the silica as quartz or chert. During crystallization, the coloured bands are not disturbed.