File:Amygdaloidal_andesite.jpg · Wikimedia Commons · See Wikimedia Commons
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende.
Andesite is a volcanic rock that falls between basalt and rhyolite in terms of silica content, making it an intermediate type of igneous rock. It is composed mainly of sodium-rich plagioclase minerals along with pyroxene or hornblende, and has a fine-grained texture that may include some larger crystals visible to the naked eye.
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Key facts
- Rock.name
- Andesite
- Rock.type
- Igneous
- Rock.image
- Amygdaloidal andesite.jpg
- Rock.caption
- A sample of andesite (dark groundmass) with amygdaloidal vesicles filled with zeolite. Diameter of view is 8 cm.
- Rock.composition
- Intermediate: plagioclase (often andesine) and pyroxene or hornblende
- Rock.composition_secondary
- Magnetites, biotite, sphene, and quartz
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Wikidata facts
- Subclass of
- volcanic rock
- Image
- Amygdaloidal andesite.jpg
Show 3 more facts
- described by source
- Encyclopædia Britannica 11th edition
- Commons category
- Andesite
- exact match
- purl.obolibrary.org/obo/ENVO_01000441
Sources (6)
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Article · 中文
安山岩（英語：andesite）密度約為2.5 - 2.8g/cm3，是一种中性火山喷出岩，是造山带最普通的火山岩，其中含有斑晶，斑晶是中性斜长石，深色矿物有辉石、角闪石，基质为隐晶质，由斜长石和极少量正长石或石英组成。主要含有的矿物是铁、钛的氧化物。“安山岩”这个词是来源自南美洲的“安第斯山脈”。 安山岩的分类主要依据起斑晶中含有的不同成分，如辉石安山岩、云母安山岩、角闪石安山岩等。安山岩的化学和矿物成分同闪长岩相当，是流纹岩和玄武岩之间的过渡類型岩石，含有范围在57-62%的二氧化矽（化学式：SiO2）。 安山岩為構成島弧火山的重要火成岩，在新生代环太平洋地区有大量的发现。台灣的大屯火山群、富貴角、關子嶺。在台灣，有許多廟宇建造時使用，有三峽祖師廟，行天宮和南鯤鯓代天府等等都屬於安山岩。
Abstract from DBpedia / Wikipedia · CC BY-SA
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