I love how it is simple and yet we can build great things using our imagination within this world filled with cubes representing stone and dirt.
That said I would love this game to have a subtle complexity that doesn't require more complex gameplay. I would love to see many, many more ore types added to the game. Each with their own texture variation and unique identification.
Here is a list of accepted rock/dirt/ore kinds by geologists. I am not a geologist myself, so if you see any errors please point them out, but I believe everything is mostly accurate. Some rock types are hard to define with a single pic, and some cover more than one rock type (like Websterite is a type of Peridotite)
Some of these rocks require you to quarry them properly from inside other rocks, or from mountains. So perhaps as an idea they could be produced by refining ore you have already mined.
I don't believe we will ever see this many types of rock/dirt/ore in MineCraft, but I wanted to find pictures of the different types and post them here just for inspiration and imagination (who knows maybe this will give Notch a new cool idea!)
Please enjoy, and comment on the ore you like the look of. I primarily posted this in my own interest in different building textures, because I am picky about the way my buildings look (and I personally use the Marble Mod that adds 3 marbles to the game with my own re-skins for that very reason).
Igneous Rocks: (relating to, resulting from, or suggestive of the intrusion or extrusion of magma or volcanic activity)
Andesite - an Intermediate volcanic rock
Icelandite - is a type of volcanic rock, an iron rich, aluminium poor andesite.
Anorthosite - an igneous ultramafic rock composed predominantly of plagioclase.
Aplite - a very fine grained intrusive igneous rock.
Basalt - a volcanic rock of mafic composition. (This could easily be the default stone we already see in MineCraft)
Adakite - a class of basaltic rocks containing relatively small amounts of the trace elements yttrium and ytterbium .
Hawaiite - a class of basalts formed from Ocean Island (hot spot) magmatism.
Picrite - an olivine-bearing basalt.
Basanite- a volcanic rock of mafic composition; essentially a silica undersaturated basalt. (Basanite is the black rock)
Boninite - a high-magnesian basalt dominated by pyroxene.
Carbonatite- a rare igneous rock composed of >50% carbonate minerals.
Charnockite- a rare type of granite containing pyroxene.
Enderbite- a variety of charnockite. (Could not find suitable image, sorry)
Dacite- a felsic to intermediate volcanic rock with high iron content.
Diabase/Dolerite - an intrusive mafic rock forming dykes or sills.
Diorite- a coarse grained intermediate plutonic rock composed of plagioclase, pyroxene and/or amphibole. (I really like this rock, very unique properties.)
Dunite- an ultramafic cumulate rock composed of olivine and accessories. (Very interesting primarily green rock)
Essexite - a silica undersaturated mafic plutonic rock (essentially a foid-bearing gabbro). (Looks like a textured variation of Basalt imo)
Foidolite- a plutonic igneous rock composed of >90% feldspathoid minerals.
Gabbro - a coarse grained plutonic rock composed of pyroxene and plagioclase basically equivalent to basalt. (Some rocks have different textures like these Gabbros)
Granite- a coarse grained plutonic rock composed of orthoclase, plagioclase and quartz. (An interesting fact: Granite almost always appears in very large sizes)
Granodiorite - a granitic plutonic rock with plagioclase > orthoclase.
Granophyre - a subvolcanic intrusive rock of granitic composition.
Harzburgite - a variety of peridotite; an ultramafic cumulate rock.
Hornblendite - a mafic or ultramafic cumulate rock dominated by >90% hornblende.
Hyaloclastite - a volcanic rock composed primarily of glasses and glassy tuff.
Ignimbrite - a fragmental volcanic rock.
Ijolite - a very rare silica-undersaturated plutonic rock.
Kimberlite - a rare ultramafic, ultrapotassic volcanic rock and a source of diamonds. (Perhaps we could find some of this rock around diamond deposits?)
Komatiite - an ancient ultramafic volcanic rock.
Lamproite - an ultrapotassic volcanic rock.
Lamprophyre - an ultramafic, ultrapotassic intrusive rock dominated by mafic phenocrysts in a feldspar groundmass. (The elongated black rock)
Latite - a silica undersaturated form of andesite.
Lherzolite - an ultramafic rock, essentially a peridotite.
Monzogranite - a silica undersaturated granite with <5% normative quartz.
Monzonite - a plutonic rock with <5% normative quartz. (The light grey rock)
Nepheline Syenite - a silica undersaturated plutonic rock with nepheline replacing orthoclase.
Nephelinite - a silica undersaturated plutonic rock with >90% nepheline.
Norite - a hypersthene bearing gabbro.
Obsidian - a type of volcanic glass. (Thought I would have this in here for good measure)
Pegmatite - an igneous rock (or metamorphic rock) with giant sized crystals.
Peridotite - a plutonic or cumulate ultramafic rock composed of >90% olivine.
Phonolite - a silica undersaturated volcanic rock; essentially similar to nepheline syenite.
Porphyry - a rock, usually granitic, with a porphyritic texture.
Pseudotachylite- a glass formed by melting within a fault via friction.
Pumice - a fine grained, extremely vesicular volcanic rock. (This stone is very light. I have found them where I live.)
Pyroxenite - a coarse grained plutonic rock composed of >90% pyroxene.
Quartz Diorite - a diorite with >5% modal quartz.
Quartz Monzonite - an intermediate plutonic rock, essentially a monzonite with 5-10% modal quartz.
Rhyodacite - a felsic volcanic rock which is intermediate between a rhyolite and a dacite.
Rhyolite - a felsic volcanic rock. (Very interesting looking rock imo.)
Comendite - a peralkaline rhyolite.
Pantellerite - an alkaline rhyolite-rhyodacite with amphibole phenocrysts.
Scoria - an extremely vesicular mafic volcanic rock. (Interestingly, all of the rock you see here is Scoria. It comes in many colors.)
Sovite - a coarse grained carbonatite rock. (Could not find suitable image, sorry)
Syenite - a plutonic rock dominated by orthoclase feldspar; a type of granitoid.
Tachylyte - essentially a basaltic glass.
Tephrite - silica undersaturated volcanic rock; can be a generic term.
Tonalite - a plagioclase-dominant granitoid.
Trachyandesite - an alkaline intermediate volcanic rock. (The black rock.)
Benmoreite - sodic trachyandesite. (I believe its the grey stone?)