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THE ROCK CHRONICLES: Green Schist

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What is greenschist? Greenschist is a fine-grained to medium-grained foliated metamorphic rock. It is dominated by chlorite (ClO2-), actinolite (Ca2(Mg,Fe)5Si8O22(OH)2), and epidote (Ca2(Al,Fe)2(SiO4)3(OH)). Greenschists form by regional metamorphism of mafic igneous rocks, usually basaltic rocks, under greenschist facies metamorphism. The name comes from commonly having an abundance of green minerals such as chlorite, serpentine, and epidote, and platy minerals such as muscovite and platy serpentine. Figure 1. Unpolished green schist with visible sharp side. Figure 2. Visible dull sides of an unpolished green schist. Figure 3. Diamond-like polished green schist pictured with its sharp side visible. Figure 4. Visible blunt edges of the polished green schist. Specific Characteristics of Greenschist Based on observation, the rock was sort of dusty and dull at first but after polishing it by washing it with water, the green color of ...
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Bukid Series 2: Mt. Pinatubo

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By: Erika Florence P. Inez Aerial view of Mount Pinatubo (http://noypicollections.blogspot.com/2011/07/mt-pinatubo-dilemma-turns-to-tourist.html) Standing 1,486 meters above sea level, Mt. Pinatubo is highly one of the Philippines' most famous mountains. Located on the   tripoint  boundary of the  Philippine provinces  of  Zambales ,  Tarlac  and   Pampanga , all in  Central Luzon  on the northern island of  Luzon, this mountain is well-known for its eruptive history. Pinatubo was once obscure, covered with dense forests and is supported several thousand indigenous Aetas. It was a little known volcano and it had been dormant for almost 400 years. But in 15 June 1991 , Mt. Pinatubo erupted, and it became the second largest volcanic eruption of the 20th century. Complicating the eruption was the appearance of Typhoon Diding (International name: Typhoon Yunya), bringing a lethal mix of ash and rain to the neighbor...
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Mass Wasting: The Naga Landslide

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By: Marie Ernestine Patindol The Naga Landslide on 20 September 2018 which killed 78 people. RAPPLER. Retrieved from https://www.rappler.com/nation/212976-naga-cebu-officials-warned-of-landslide-prone-areas-in-2008 Mass wasting, which is sometimes called mass movement or slope movement, is defined as the down slope movement of rock and regolith near the Earth's surface mainly due to the force of gravity. It is a type of erosion, and is capable of making big changes to the side of a mountain. Last year, 20th of September 2018, a horrifying tragedy just unfolded before our eyes. About 80 hectares of earth moved and buried more than a hundred of people in Naga City, Cebu. When I saw the news and the footage of the landslide, it made me think, what if the mountains were not bald and trees are abundant during that time, could the tragedy have been avoided? The baldness of the mountain really stood out and that could be one of the factors why the tragedy occurred. One o...
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