Greetings. Here are some new suggestions:

1)Calcium 

Section: Solids

(CALC)

Silver coloured metal, melts at 838.85 C, oxidizes when contacting with OXYG forming CAO (see number 2). Cannot break from pressure. If BRMT is put on it and heated for about 500 degrees, BRMT will turn into IRON (solid). (Update: CALC turns to CAO in this reaction) Reacts with water, making CAOH (see 3) and hydrogen. Conducts at normal speed.

Can be used as a building material or to make IRON from BRMT. 

2)Calcium oxide 

Section: Powders

(CAO)

White powder, can be mixed with water to make CAOH (see 3) or with CO2 to form CACO (see 4)

Useful for factories.

3)Calcium hydroxide 

Section: Liquids 

(CAOH)

White liquid, can be heated to form CAO and WTRV or mixed with CO2 to make CACO (see 4) and water.

Useful in factories, buildings and gas facilities. 

4)Calcium carbonate (aka marble)

Section: Solids

(CACO)

White strong solid, doesn't break from pressure but decays onto CO2 and CAO when exposed to temperatures above 900 C.

Useful in building and as a good replacement of ceramic in bone models.

Thanks for your attention.