English
I love studying Rocks and Zagreb has a lot of Limestone and Granite.
Granite is a coarse grained, igneous rock with an even texture and color. It’s composed primarily of quartz and feldspar, with small amounts of mica, hornblende, and other minerals. Granite was formed by molten rock (magma) material beneath the Earth's surface crust. As it rose, it cooled, and was under tons of pressure for millions of years, allowing it to form a unique crystalline granular structure. As the quartz, feldspars, micas and other minerals fuse into the rock, the granite gets its beautiful array of color and pattern.
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(1) Measure the crystals and average their size. Do you think the grainte is coarse, medium, or fine grained by using the following scale. Coarse crystals over 5mm in length, medium crystals between 1-5 mm in length, or fine crystal less than 1mm in length.
(2) Now you have established the size of the crystals, determine if the granite cooled down slowly or quickly, explain your answer.
(3) What are the three predominant colours of this Granite?
(4) What do you think the mineral is that forms the colourless Crystal?
(5) On the Tram side of the clock you will see a small dark patch in the granite, what is the name given to this by geologists.
(6) Do you think the dark patch is a fossil? explain your answer.
(7) Not compulsory but would be nice if you can upload a photo of yourself or GPS at GZ.
Croatian
Volim proučavanje stijena i Zagreb ima puno vapnenca i granita.
Granit je krupnozrnatom, magmatske stijene s čak teksture i boje. To je sastavljen prvenstveno od kvarca i feldspata, s malim količinama tinjca, hornblenda i drugih minerala. Granit je nastala rastaljenih stijena (magma) materijala ispod Zemljine površine kore. Kao što je ruža, ona ohladi, a bio je pod tonama tlaka za milijune godina, dopuštajući da se formira jedinstvenu kristalni granulirani strukturu. Kako su kvarc, Feldspati, Tinjci i drugi minerali osigurač u stijenu, granit dobiva svoju prekrasnu lepezu boja i uzorak.
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(1) Mjera kristala i prosječni njihovu veličinu. Mislite li da je grainte je gruba, srednje ili fino zrnate pomoću sljedeće ljestvice. Grube kristali preko dužine 5 mm, srednje kristali između 1-5 mm dužine, ili manje od finog kristala 1mm duljine.
(2) Sada ste uspostavili veličinu kristala, utvrditi je li granit ohladi polako ili brzo, objasnite svoj odgovor.
(3) Koje su tri dominantna boja ovog granita?
(4) Što mislite mineral je da formira bezbojni kristal?
(5) Na strani tramvaj na sat vidjet ćete malu tamnu zakrpu u granitu, što je naziv za to od strane geologa.
(6) Mislite li da je tamna mrlja je fosil? Objasnite svoj odgovor.
(7) Nije obavezno, ali bilo bi lijepo ako možete uploadati sliku o sebi ili GPS na GZ.