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I don't know about the rest of the world, but in Sweden the main porphyry supplier is/was Älvdalen, Dalarna.
I heard it's the place with the most porphyry in the world but I don't know if that's just the locals exaggerating.
Wiki User
∙ 11y ago
Wiki User
∙ 9y agoPorphyroblasts are distinctly large crystals in a metamorphic rock. They develop in schist and gneiss during the late stages of recrystallization.
Wiki User
∙ 13y agoA porphyry forms partly below the surface, and completes its formation at or near the surface.
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What is the mohs hardness of porphyry?
10
How fast does porphyry cool?
very slowley
What are two types of igneous rock?
Two types of igneous rock are intrusive (also called plutonic) and extrusive. There is also porphyry rock which is partly intrusive and partly extrusive. Porphyry rock has large crystals embedded in a mass of much smaller crystals. The large crystals formed underground as does intrusive rock, and were carried in lava when it erupted. The mass of smaller crystals formed around the large crystals when the lava cooled quickly above ground, as does extrusive rock.
What rocks cool slowly?
coarse grained and porphyry rock
Where did the large crystals form in the porphyry rock?
beneath earth's surface
When was Porphyry of Gaza born?
Porphyry of Gaza was born in 347.
What is a porphyry sarcophagus?
Porphyry is a type of granite that comes in various colors, that the Egyptians were known to appreciate carving things like coffins in. A stone coffin carved of porphyry is a porphyry sarcophagus.
When did Porphyry of Gaza die?
Porphyry of Gaza died on 420-02-26.
How many types of porphyry are there?
Lots
What is the mohs hardness of porphyry?
10
Is the scientific method a logical method?
Naturally. It was formed at first by Aristotle who was an excellent logician. The taxonomy is for example based on his Categories appended by the Isagoge (Introduction) of Neo-platonic philosopher Porphyry.
Is porphyry extrusive or intrusive?
intrusive
How fast does porphyry cool?
very slowley
Did porphyry cool quickly or slowly?
slowly
Is porphyry igneous sedimentary or metamorpic?
its igenoeus
What are two types of igneous rock?
Two types of igneous rock are intrusive (also called plutonic) and extrusive. There is also porphyry rock which is partly intrusive and partly extrusive. Porphyry rock has large crystals embedded in a mass of much smaller crystals. The large crystals formed underground as does intrusive rock, and were carried in lava when it erupted. The mass of smaller crystals formed around the large crystals when the lava cooled quickly above ground, as does extrusive rock.
What minerals are found in porphyry?
Mostly feldspar and quartz
