File:ابسیدین-Obsidian.jpg
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English: Obsidian or volcanic glass is a silicate-rich rock with black glass texture and is caused by the rapid cooling of the magma. Although it does not have a precise chemical composition, it is a stone that has more than 70% silica. Human was used as a tool during the Stone Age of Obsidian, and today it uses it as the raw material of the industry.Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock
فارسی: ابسیدین یا شیشهٔ آتشفشانی، سنگی غنی از سیلیکات است که بافت شیشه ای سیاه رنگی دارد و از سرد شدن سریع ماگما به وجود می آید. اگرچه این سنگ ترکیب شیمیایی دقیقی ندارد اما سنگی است که بیش از ۷۰ درصد سیلیس دارد. بشر در دوران سنگ از ابسیدین تراش داده شده به عنوان ابزار استفاده می‌کرده است و امروزه از آن به عنوان ماده خام صنایع استفاده می‌کند. |
| Date | |
| Source | Own work |
| Author | Mahdikarimi70 |
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This image was uploaded as part of Wiki Science Competition 2017. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 05:26, 11 December 2017 | | 4,000 × 2,664 (6.81 MB) | Mahdikarimi70 (talk | contribs) | User created page with UploadWizard |
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