A melter.
Look at my post #15
If you’re asking about what container you can melt it in, you can use, for instance, graphite crucibles, or perhaps alumina. I’m not sure o their mps, but they’re pretty high.
I’ve seen pictures of the things they use for melting glass after long usage, by the way – the firebrick the structures are built of are severely eroded. Molten glass, besides being monstrously hot, is also corrosive.
That’s right. Just because you have molten rock, that doesn’t mean you can take it for granite.
Gneiss one!
What, do you keep your radio tuned to clastic rock stations? 
God, the Schist you guys listen too…
If I wasn’t so sedimentary right now I’d be posting alot more, but I’m tired. :rolleyes:
Consider your igneous fought!
Cast basalt is commonly availabe for tiles, countertops and other uses.
Re what you can use for a high temperature mold, just what is the most heat resistant solid that won’t react with air? I would presume some metallic oxide like maybe beryllium oxide or alumina, but who’s the refractory champ? What is firebrick usually made out of?
Granite melts from around 2219 degrees F to 2300 degrees F.
I’ve used zirconium crucibles for temperatures up to 1800 C. That should work for granite.
Compared to the age of the OP’s granite samples, the OP’s thread is nearly brand new. Nearly.
Shame to see so many deceased dopers in one place. We miss ya.
Is there something about geology that kills its practitioners off prematurely? I’m thinking like early chemists.
Some vulcanologists had a run of bad luck a few years ago.
(Okay, 24is really stretching “a few.” Time and scientist bits really flies…)
I suppose it depends on how much time they spend looking up at cliffs saying “I wonder how unstable that stuff is?” 
Depending on how you’re heating it, you can melt any given substance in a container made out of the same substance. Heat it from the top, like with a blowtorch or a powerful laser, and make a little molten puddle in the top surface. Now, molding it, that might be more difficult: You could use a chilled mold made of the same substance, but then you’d have a hard time separating the mold from the casting, and if you have some technique for shaping the substance into the mold, why not use that same technique for shaping the final product directly?
This is a characteristic of granite. I don’t know the right terminology but it’s some kind of aggregate of minerals that is usually apparent to the naked eye. IIRC it’s also somewhat less dense than most other rock and large bodies of granite tend to float upward toward the surface. There are a lot of different types of granite though so I assume the term ‘granite’ itself doesn’t refer to any specific composition of materials, just the physical structure of the rock and the way it forms.
Besides the volcanoes mentioned? IME, malaria is the biggest killer of field geologists, followed by ice/exposure and animals (bears, for one. If you’re really unlucky, seals). Volcanoes are a distant fourth.
The term you want is “phaneritic texture”
No, it refers to both the composition (silica-rich, or “felsic”), and the way it forms (plutonic - emplaced in the earth - not volcanic - extruded). The emplacement usually dictates coarseness of the texture. Granite specifically is igneous rock with between 20% and 60% SiO[sub]2[[/sub] (quartz) with 35%+ alkali feldspar vs plagioclase. Similar felsic rocks of different compositions but similar texture are just “granitic”. Extruded, usually finer-grained rocks of “granitic” composition are called rhyolite.
Granite, sensu strictu, is only one zone of a continuum of rock compositions. Behold! The wonder that is the QAPF diagram. Bane of first year geology students worldwide.
