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Minecraft has many ores, but not quite enough. This is where calcite comes in. Calcite is kind of like a fools diamond. It has a blueish white color that will be hard to tell apart from diamond. It will be mineable by iron or higher, just like diamond. It will spawn in the same layers as diamond. It will be as rare as diamond. And it will be marginally useless. Unlike diamond, calcite will be used mostly for decoration. Calcite blocks will have a quartz - like texture, but with blue highlights throughout. Calcite slabs and stairs will be available. The only other use for this ore will be tool repair. If placed in an anvil with any tool, it will do and excellent job of repairing it. I believe this is a pretty balanced ore, since its rarity is equal to diamond and the tool repair is not overpowered.

Why? It's just pointless. Also, you can repair a tool with the corresponding ingot, why would you need this?

Pointless and you can already make repairs with ingots.

Well its kind of ment to be pointless, hence the title as fools diamond. Calcite isn't really something you look for, its something you run into while looking for diamond. You could also repair diamond tools with it, so the repairing isn't all worthless.

Instead of using precious diamond to repair your diamond tools, you can use useless but just as rare calcite, thus preserving your diamond tools without using actual diamond.

Quote from Ender_Golemed

Well it's kind of meant to be pointless, hence the title as fools diamond. Calcite isn't really something you look for, its something you run into while looking for diamond. You could also repair diamond tools with it, so the repairing isn't all worthless.

In that case it's a fake ore. Commonly suggested thread

Quote from Ender_Golemed

Instead of using precious diamond to repair your diamond tools, you can use useless but just as rare calcite, thus preserving your diamond tools without using actual diamond.

That defeats the purpose of using the material that the tool/armor is made out of to repair it.

You seem to be one of those users who's pessimistic. Didn't you read? He said it is an alternative to using diamond to repair tools and can be used as a decoration item with the block, slabs, and stair variants. Although it seems like a decent idea, I cannot support this because villagers provide diamond tools and armor to repair enchanted tools and the decoration aspects seem a bit plain. Ender_Golemed, your idea needs something more worthwhile, but new decorations are a small plus.

Maybe using Calcite to repair an item will reset the item repair cost?

I think this is a great ideal, instead of risking real diamonds in SMP for traps, you can use this

Ah yes, getting my hopes up and having them subsequently destroyed is an experience I want every time I go mining!

This was sarcasm if you couldn't tell.

Yeah.....no. In addition to what everyone else has said, calcite has a Mohs hardness of 3 (same as a copper penny), whereas diamond has a Mohs hardness of 10 (the highest). Using calcite to repair diamond doesn't make any sense.

Quote from vonamor

I cannot support this because villagers provide diamond tools and armor to repair enchanted tools

Ever try repairing something like an Efficiency V, Fortune III, Unbreaking III pickaxe by combining with a new pickaxe? Too expensive, right? Well, you CAN repair it if you use diamond instead, so using such tools requires that you find actual diamonds, or only have 1-2 enchantments on a tool or repair with mostly depleted items (which requires using them to deplete them when you'd rather want to use your enchanted items, not unenchanted ones).

However, this idea just sounds like the equivalent of using the 1.8 snapshots to double the frequency of diamond ore, as far as using diamonds to repair stuff is concerned (which is all I use them for after making a set of gear), and diamonds are already common enough that I have no problems at all finding enough (they could even be 10 times rarer) and they shouldn't be that easy to find for new players.

Not only that, if decorative blocks were its primary use it would need a high drop rate similar to lapis (4-8 per ore), which is only slightly more common than diamond overall, to offset being similarly rare so using it as decoration is reasonably easy, which would make effectively make it many times more common than diamond (a single lapis ore can give up to half a stack with Fortune).

The suggestion to use it to reset repair costs (which can no longer be held down by renaming in 1.8) is a good one though, but it still conflicts with the preceding as such a material should be uncommon (perhaps use name tags to rename tools instead of directly on the anvil, although since 1.7 name tags are now renewable through fishing).