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?? Phaneritic ?? - what is that?? - DP/EC 143

A cache by Lord of the Rocks Send Message to Owner Message this owner
Hidden : 04/13/2020
2 out of 5
1.5 out of 5

Size: Size:   other (other)

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Geocache Description:


This EarthCache is 3/3 on the subject of textures of igneous rocks.


What is texture in a rock?

The texture of a rock is the size, shape, and arrangement of the grains (for sedimentary rocks) or crystals (for igneous and metamorphic rocks).

Phaneritic texture

This texture describes a rock with large, easily visible, interlocking crystals of several minerals. The crystals are randomly distributed and not aligned in any consistent direction. A phaneritic texture is developed by the slow cooling and crystallisation of magma trapped within the Earth's crust and is characteristic of plutonic rocks.

In this case you are asked to examine a very common igneous rock that has three (3) main mineralogical components in terms of mineralogy. This will become aparent in the tasks you have to carry out to validate your FOUND.


Validating your FIND:

  1. Observe carefully and say how many different coloured minerals you can see besides the three main ones that are the focus of the next questions.
  2. What is the general colour of this rock? Choose from blue, grey, beige, purple.
  3. Which colour mineral is the smallest of the three?
  4. What is the average size of the light-coloured minerals?
  5. Take a photo of your nick written on a piece of paper such that the phaneritic rocks can also be seen in the background but such that there are no spoilers - mandatory task.


Esta EarthCache é 3/3 na temática das texturas de rochas ígneas.

A que se refere a textura numa rocha?

A textura de uma rocha é o tamanho, forma e disposição dos grãos (para as rochas sedimentares) ou cristais (para as rochas ígneas e metamórficas).

Textura fanerítica

Essa textura descreve uma rocha com cristais grandes, facilmente visíveis e entrelaçados de vários minerais. Os cristais são distribuídos aleatoriamente e não alinhados em nenhuma direção consistente. Uma textura fanerítica é desenvolvida pelo arrefecer lento e cristalização do magma preso na crosta terrestre. Esta textura é característica das rochas plutónicas.

Vais examinar uma rocha ígnea muito comum que é composta essencialmente por três (3) minerais principais. Na tarefas irás perceber melhor a composição e textura desta rocha.

 Para validares a tua visita:

  1. Qual é, na generalidade, a cor geral desta rocha? Escolhe entre azul, cinza, bege e roxo.

  2. Esta rocha é composta por três minerais distintos. Observa atentamente diz-me quais são as cores deles?

  3. Qual mineral de côr dos três é o menor em termos de tamanho ?

  4. Qual é o tamanho médio dos minerais?

  5. Tira uma foto do teu nick escrita num pedaço de papel, de modo que as rochas faneríticas também possam ser vistas em segundo plano, mas de modo que não haja spoilers - Tarefa obrigatória.



aThe most exciting way to learn about the Earth and its processes is to get into the outdoors and experience it first-hand. Visiting an Earthcache is a great outdoor activity the whole family can enjoy. An Earthcache is a special place that people can visit to learn about a unique geoscience feature or aspect of our Earth. Earthcaches include a set of educational notes and the details about where to find the location (latitude and longitude). Visitors to Earthcaches can see how our planet has been shaped by geological processes, how we manage the resources and how scientists gather evidence to learn about the Earth. To find out more click HERE.

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