化石講場-Fossils Board 首個古生物/恐龍/化石華語討論區 - [化石鑑賞 Fossil Collections] - 這貝殼是真的嗎

化石講場-Fossils Board » [化石鑑賞 Fossil Collections] » 這貝殼是真的嗎

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rock-tw (馬英走~~)
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[廣告]:

這貝殼是真的嗎

有顏色貝殼..

附件: 您所在的用戶組無法下載或查看附件

2007-11-20 01:37 PM

Franco仔 (震旦紀)
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[廣告]:

是真的........(75% sure )

我愛活化石!

2007-11-20 04:22 PM

路人甲
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好漂亮的貝殼啊!

鳥是恐龍!恐龍是鳥

2007-11-22 03:25 PM

fossilshk (Lung)
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[廣告]:

QUOTE:

原帖由 rock-tw 於 2007-11-20 01:37 PM 發表
有顏色貝殼..

opal 蛋白蛤化石,好東西

2007-11-23 08:15 PM

tuff
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不錯!!

2007-12-10 10:14 PM

hunter-hunted
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[廣告]:

請回點解有七彩顏色的?

2007-12-13 03:27 PM

Dinozoo (權)
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QUOTE:

原帖由 hunter-hunted 於 2007-12-13 03:27 PM 發表
請回點解有七彩顏色的?

看下文:

Precious opal shows a variable interplay of internal colors and does have an internal structure. At the micro scale precious opal is composed of silica spheres some 150 to 300 nm in diameter in a hexagonal or cubic closed-packed lattice. These ordered silica spheres produce the internal colors by causing the interference and diffraction of light passing through the microstructure of opal (Klein and Hurlbut, 1985, p. 444). It is the regularity of the sizes of the spheres, and of the packing of these spheres that determines the quality of precious opal. Where the distance between the regularly packed planes of spheres is approximately half the wavelength of a component of visible light, the light of that wavelength may be subject to diffraction from the grating created by the stacked planes. The spacing between the planes and the orientation of planes with respect to the incident light determines the colors observed. The process can be described by Bragg's Law of diffraction. Visible light of diffracted wavelengths cannot pass through large thicknesses of the opal. This is the basis of the optical band gap in a photonic crystal, of which opal is the best known natural example.

2007-12-13 09:16 PM

rock-tw (馬英走~~)
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[廣告]:

QUOTE:

原帖由 Dinozoo 於 2007-12-13 09:16 PM 發表

看下文:

Precious opal shows a variable interplay of internal colors and does have an internal structure. At the micro scale precious opal is composed of silica spheres some 150 to 300 nm ...

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