Praktikum singkapan sismrkr
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  PRAKTIKUM SINGKAPAN BATUAN KOMPETENSI Mampu mendeskripsikan jenis batuan dan nama batuan berdasarkan singkapan yang ada di lapangan. SKETSA SINGKAPAN TUJUAN -   Mendeskripsikan singkapan batuan melaui sketsa gambar -   Mendeskripsikan jenis batuan yang ditemui dari singkapan di lapangan melalui identifikasi geologi fisis HASIL IDENTIFIKASI SINGKAPAN  Nama dan NIM : Ceklis STARTThe rockhaslayering.No visiblegrainsare presentin the rock.Visible grainsare presentin the rock.The rock hasadditionalfeatures. The rock isprobably: FLOWCHART FOR CLASSIFICATION OF ROCKS AS IGNEOUS, SEDIMENTARY, OR METAMORPHIC Layers are flat and soft or crumbly.Layers are made of mud, sand, or gravel.Layers are made of crystals, which are about the same size in all layers.Layers are made of crystals, which are of different sizes in different layers.Layers are folded or otherwise deformed.sedimentarysedimentarymetamorphicsedimentaryor igneousmetamorphicLooks like dry clay or mudLooks glassy Very soft, easily scratched with fingernail Very hardReacts (effervesces) with drop of dilute HClDense and hard, like window glassBrittle, lightweight, opaque black: i.e., anthracite coalsedimentaryigneousmetamorphicsedimentaryigneoussedimentary    G  r  a   i  n  s  a  r  e  m  o  s   t   l  y  m   i  n  e  r  a   l  c  r  y  s   t  a   l  s   (      c     r     y     s      t     a       l       l       i     n     e     t  e  x   t  u  r  e   ) . Contains fossilsGrains are mostly sand, silt, or gravel (a clastic  texture).Contains rounded grains (like pebbles) (a clastic  texture)Contains grains that are fragments of other rocks (a clastic  texture)sedimentarymetamorphicsedimentarysedimentarysedimentaryWhole or fragmented leaves, stems, shells, footprintsThe fossils are so deformed (sheared, folded, or ofchanged composition) that they are barely recognizableCrystals are randomly oriented in very hard rock.Large crystals sit in a very hard mass (   groundmass ,  matrix   )with smaller crystals or no visible grains.Crystals can be easily scratched and/or broken apart.Crystals are flat (e.g., mica) and foliated  : lay parallel to oneanother, giving the rock a layered or scaly appearance.Long crystals are foliated  : lay parallel to one another.Crystals are calcite:they react (effervesce)with dilute HCl.Crystals are mostly gypsum or halite.Crystals are mostly olivine, feldspar, or pyroxene.Crystals are mostly garnet, micas (muscovite, biotite),serpentine, graphite, galena, or sphalerite.igneous ormetamorphicigneoussedimentarymetamorphicmetamorphicmetamorphicsedimentarysedimentaryigneousmetamorphicRock looks metallic (silvery, brassy, or copper-like) and scaly or smooth.Rock is vesicular  : has bubble-shaped holes/cavities or looks frothy.Rock is very hard and has ropy, streamlined flow structures.metamorphicigneousigneous Equigranular  : all about same sizeHave different sizes and/or occur in layers  
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