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This is everything that can be found within the earth (metals, stones, gemstones, etc).

An institution that seeks out minerals generally goes like this:

Exploratory Tunnels
5 Goodwill | 0 Wealth | 0 Ages
A team of miners have taken up shop here, digging exploratory tunnels into the earth.

Which progresses into...

[Material] Mine
X Goodwill | 0 Wealth | 0 Ages
The exploratory tunnels have found great riches at great depths.

Which progresses into...

[Material] Refinery
20 Goodwill | 1 Wealth OR 1 Age
Local investments have drawn in more workers and the establishment of a refinery, resulting in much more valuable exports.

Which progresses into...

[Material] Workshop
20 Goodwill | 1 Wealth OR 1 Age
A master artisan and their apprentices have taken up residence in the local area, allowing for the creation of great works made from the local goods.

Exceptions can be made for this general path. If you, for example, want to establish just a refinery and workshop but rely on others for mines, that's cool! If you would rather spend a bit more to have your mine staffed by demons or something instead of normie Alterans, that's cool too!

MUNDANE STONE (0)
For now, you can just have rocks. Someone somewhere out in the rock has a quarry for whatever kind of stone you're after.

MUNDANE METALS (0)
Ditto with stone, someone somewhere out in the world has a copper mine. If it's not listed on here, it's safe to assume you can just kind of have (poor, limited) access to it by fiat.

GEMS (10)
Gemstones of whatever kind you fancy. Once an age, a gem refinery produces a gem that is usable as a master hearthstone for Eviscism.

GOLD (20)
Gold is as beautiful on Altera as it is in our world.

GLIMMERSTEEL (30)
Translucent steel, like cloudy glass, that glimmers. Small, almost invisible shards of Immortal Diamond lace this steel, giving it the signature, glimmering shine. Due to these shards, the material is extremely abrasive, and sharp. Running a bare hand across a flat surface will cause shredded, bleeding skin. Deep cuts or thrusts caused by this weapon will induce intense bleeding, and wounds that are difficult to heal. Local Glimmersteel mines produce Glimmersteel of only one hue, such as red, blue, or purple. 

IMMORTAL DIAMOND (n.a)
Immortal Diamond can only be created as a rare byproduct of Glimmersteel refining. Once every age, enough Immortal Diamond dust is accumulated that a single craft (such as a breastplate, sword, etc) can be made out of Immortal Diamond per mine supplying the refinery. It is the same hue as the local mine that produced it (or multicolored, in the case of combining multiple mines).

Immortal Diamond's primary utility is that it is totally unbreakable, it never tarnishes, and it is utterly inflexible. It is glassy in appearance, not cloudy like Glimmersteel. It can be formed into shape once within a kiln, and then never changed again.

IRSIZ-FYR (10)
Irsiz-Fyr is able to absorb and hold onto heat better than any other material. Leave it in a fire for a few minutes, and it will emerge glowing red hot, and stay that hot for days afterwards. How hot Irsiz-Fyr can get before melting and how long it stays hot depends on the skill of the manufacturer. Irsiz-Fyr naturally has a coppery appearance, even though it is functionally interchangeable with iron outside of its unique heat-retaining property.

SILVER (15)
Silver is as beautiful on Altera as it is in our world.

STARBLOOD (30)
Starblood is antithetical to the divine. It causes blessed flesh to rupture and burst on contact, and wounds caused by Starblood cannot be healed by divine magic. Blessed objects that come into contact with Starblood permanently tarnish where the two met.

Starblood has a dark, dusky appearance. It develops a harmless red patina after being exposed to the air for more than a day. Some prefer to allow it to develop the patina, and some meticulously clean their blade once a day to erase it.

STEEL (5)
Steel begins as an iron mine, which is then refined into steel and so on. Steel functions as our mundane, real life steel does; it's just less common on Altera because of the difficulty and mystique of its refining process.

THE MAGE'S REWARD (30)
TMR is antithetical to the arcane. It causes enchanted flesh to rupture and burst on contact, and wounds caused by by TMR cannot be healed by arcane magic. Enchanted objects that come into contact with TMR permanently tarnish where the two met. Arcane objects confined by TMR such as chains or a container are rendered inert for as long as it remains that way.

TMR resembles coal, with white flecks. It is infused into steel by burning it, and allowing the steel material to rest on the burning TMR as it cools, thus infusing the metal with it. Once infused, it takes on a much darker and patterned surface like Wootz steel.