Starry hmo ntuj obsidian

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Gemstone Nqe Lus

Starry hmo ntuj obsidian

Yuav cov khoom noj hnub qub tsaus ntuj zes hauv peb lub khw


Starry hmo ntuj obsidian, tseem npe Firecracker obsidian lossis paj obsidian.
Qhov zoo nkauj ua ke ntawm dub obsidian nrog txaws ntawm coral, lee, paj yeeb thiab paj daus dawb thoob plaws.

Obsidian

Obsidian yog ib qho tshwm sim ua tshwm sim ntawm volcanic iav ua lub pob zeb uas muaj hluav taws kub heev.

Obsidian yog tsim thaum felsic lava extruded los ntawm lub roob hluav taws txias sai sai nrog kev siv hluav taws xob tsawg kawg. Nws feem ntau pom nyob rau hauv cov npoo ntawm rhyolitic lava ntws hu ua obsidian ntws, qhov twg cov tshuaj lom neeg: cov ntsiab lus siab ntawm silica, ua rau muaj viscosity siab, uas, thaum lub nrawm nrawm, ua rau lub iav ntuj tsim los ntawm lub lava. Qhov kev txwv ntawm atomic diffusion los ntawm cov lava uas muaj dej khov no piav qhia qhov tsis muaj kev loj hlob siv lead ua. Obsidian yog qhov nyuaj, nkig, thiab amorphous. Nws thiaj li tsoo nrog cov npoo ntse. Yav dhau los, nws tau siv los tsim kev txiav thiab tho cov cuab yeej, thiab nws tau siv sim ua kev phais mob taub hau hniav.

Starry hmo ntuj obsidian thaj chaw

Obsidian yog tsim los ntawm lava txias sai, uas yog cov khoom siv niam txiv. Kev tsim kev kub ntxhov ntawm cov neeg kub ntxhov yuav tshwm sim thaum favaic lava txias sai sai rau ntawm cov npoo ntawm favaic lava ntws lossis volcanic dome, lossis thaum lava txias thaum lub sijhawm sib chwv nrog dej lossis huab cua. Kev tsim muaj cov yeeb yaj kiab thaum lub caij nplooj zeeg txias thaum lub pob zeb ploj.

Obsidian is mineral-like, but not a true mineral because as a glass it is not crystalline. In addition, its composition is too variable to be classified as a mineral. It is sometimes classified as a mineraloid. Though obsidian is usually dark in color, similar to mafic rocks such as basalt, obsidian’s composition is extremely felsic. Obsidian consists mainly of silicon dioxide, usually 70% or more. Crystalline rocks with a similar composition include granite and rhyolite. Because obsidian is metastable at the Earth’s surface, over time the glass becomes fine-grained mineral crystals, no obsidian has been found that is older than the Cretaceous period. This transformation of obsidian is accelerated by the presence of water. Although newly-formed obsidian has a low water content, typically less than 1% water by weight, it becomes progressively hydrated when exposed to groundwater, forming perlite.

Starry hmo ntuj obsidian, los ntawm Mexico


Yuav cov khoom noj hnub qub tsaus ntuj zes hauv peb lub khw

kev ua yuam kev: Cov ntsiab lus yog kev tiv thaiv !!