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標題: 這貝殼是真的嗎 [打印本頁]

作者: rock-tw 時間: 2007-11-20 01:37 PM 標題: 這貝殼是真的嗎

有顏色貝殼..

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http://www.fossilshk.com/forum/attachment.php?aid=732

作者: Franco仔 時間: 2007-11-20 04:22 PM

是真的........(75% sure )

作者: 路人甲 時間: 2007-11-22 03:25 PM

好漂亮的貝殼啊!

作者: fossilshk 時間: 2007-11-23 08:15 PM

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

作者: tuff 時間: 2007-12-10 10:14 PM

不錯!!

作者: hunter-hunted 時間: 2007-12-13 03:27 PM

請回點解有七彩顏色的?

作者: Dinozoo 時間: 2007-12-13 09:16 PM

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.

作者: rock-tw 時間: 2007-12-14 10:07 PM

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 ...

......................

看懂嗎
我不

作者: Dinozoo 時間: 2007-12-15 11:11 AM

簡單來說, 是蛋白石的晶體結構使反射出來的光產生繞射和干涉...

作者: tuff 時間: 2007-12-15 02:38 PM

QUOTE:

原帖由 Dinozoo 於 2007-12-15 11:11 AM 發表
簡單來說, 是蛋白石的晶體結構使反射出來的光產生繞射和干涉...

還要打磨了最面層才可看到那些點亮七彩顏色.

作者: 達爾文 時間: 2007-12-22 12:11 AM

tuff對，rainbow的菊石面亦是沒彩色的，打磨才見到彩

[ 本帖最後由達爾文於 2007-12-22 12:12 AM 編輯 ]

作者: ex800236 時間: 2008-4-27 07:31 PM

是真的
這是蛋白化的蛤化石

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