Quartz with a Fiery Heart

earthstory:

Quartz with a fiery heartLooking like a doorway into another dimension, this wonderful crystal of quartz held a secret within. The dark orange brown agate in the centre is surrounded by haloes of iron oxide minerals, probably haematite (see http://tinyurl.com/nngtpnh), and displays the iridescent 3d optical effect known as fire agate, discussed previously at http://tinyurl.com/kxfh644.LozImage credit: Fender Minerals

“Looking like a doorway into another dimension, this wonderful crystal of quartz held a secret within. The dark orange brown agate in the centre is surrounded by haloes of iron oxide minerals, probably haematite, and displays the iridescent 3d optical effect known as fire agate.” Loz

Image credit: Fender Minerals

Fire Agate

“Coloured a deep chocolate brown and displaying a dazzling iridescent effect somewhat similar to ammolite or opal, fire agates are one of the rarest forms of microcrystalline silica. The colours, that change when the stone is rotated under a light source are due to a phenomenon called thin film interference, something you all see in the sheen of petrol puddles on water.

The layers are composed of alternating agate and iron oxide, and usually occur in this slightly bulgy shape known to mineralogists as botryoidal. They each reflect the light differently, creating waves of interference whose colour depends on the thickness of the layers, which are of similar size to the wavelengths of light. Thicker layers produce reds and greens, and thinner ones the rarer blue and violets.

It is found in the southwest USA, Mexico and Brazil and formed in a hydrothermal geological environment from hot mineralised fluids precipitating silica and iron oxide when encountering changed conditions. These resulted from huge circulating cells of heated waters deep in the Earth interacting with magmas.” Loz

Image credit: Ganoskin Project

http://www.mindat.org/min-7601.html
http://www.yourgemologist.com/fireagate.html

via [The Earth Story]

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One Response to Quartz with a Fiery Heart

  1. bwcarey says:

    Reblogged this on paddypicasso and commented:
    look at these

    Like

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