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After creating the mapping program described in my article User_blog:Mrob27/Internal_Data_Format, I began to compute statistics of the relative abundances of the various materials that the moon is made up of.

Here is a sample of the statistics I found, showing two different "sectors" (128x128 map parts) of a brand-new untouched moon I created for the data format article:

 BT  -----name-----  ---abundances---
                     sector1  sector2
  4            rock  905646   871420
  6          gravel  86744    100774
  2            dirt  55465    65752
  3            sand  18605    18448
  8           water  8859     11275
  1         topsoil  8658     8633
 19       magnetite  278      545
 11        aluminum  104      397
 23        titanium  165      302
 13            gold  60       237
 25        notchium  61       137
 27     bluecrystal  21       46
 16   yellowcrystal           14
130                  3

(For more statistics and analysis, see the separate article User_blog:Mrob27/Relative_Abundances_of_Materials)

By comparing the "sector1" and "sector2" numbers, you can see that the amounts of different materials vary a lot from one area to another. The block type (BT) in this list is the actual number found in the map data, which distinguishes the two different types of Dirt. The numbers here are all one number higher than the blocktypes in items.txt, so for example Aluminum ore is 11 here, but is 10 in items.txt.

But the really bizarre thing is the last item, block type "130". I found this in three (out of nine) sectors of the map data in this world, all of them buried a significant distance underground:

Bt-130.0-prospect-map

So I set out across the wilderness to locate this rare mineral. First I located the site of the block type 130 deposit, and marked it with Amethyst Ore:

Bt-130.1-prospect-site

I mined down to it and cleared out a room around it:

Bt-130.2-in-situ

When one of these blocks is mined, a Disk is added to the inventory:

Bt-130.3-have-new-disk

Scanning this new disk shows it is item "disk8" (blocktype 129 in items.txt) which is described as "TYPE: Data / Contents: Refine minerals to build useful items.":

Bt-130.4-disk-scan

The newly-exposed (east-facing) side of one of the remaining block-130s looks different from the top. Here are photos (from another deposit of block-130) showing what all 6 sides look like:

BT132-down-south-west BT132-up-north-east

First photo: The sides facing down, south, and west. Second photo: the sides facing up, north, and east

If you mine it from far enough away to get a floating block (the little spinning block that has been mined but not yet picked up), it looks like Molybdenum on the top, bottom and two sides and like Aluminum on the other two sides.

Bt-130.6-two-disks-third-block-hover Block 130 - 3

Block type 130's floating-block appearance. Second picture by Scooter8pie takes advantage of the Transparency cheat.

Also in the photo you see two disks in the inventory. Each block, when mined, gives you another disk, and they all scan the same.

Independent Discovery

User:Scooter8pie, who has excavated more rock than most everyone else put together (while pursuing alchemy, see his article User_blog:Scooter8pie/Alchemy_and_the_Brown_Mob) found this block while doing normal exploring (without the aid of maps). He found most of them on the surface, not underground.

I think the fact that it is found on the surface makes it more likely that these blocks are not a bug, but are perhaps left over from a time that the game designers wanted to give the player some Disks without the need to kill Astronauts. The disk you get has a fairly general, beginner-type hint, almost as noob-worthy as the "split items with multi-touch" hint you get from the disk the game gives you.

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