Re: Stones, Rocks and Minerals

**Alpine Aster** Mon 22 Nov - 21:47

Hypersthene.

**Panda** Sun 19 Dec - 4:47

Igneous Rock

**malena stool** Mon 27 Dec - 21:01

Jade

**Alpine Aster** Fri 31 Dec - 0:00

Kernite.

**malena stool** Fri 31 Dec - 23:05

Guest Fri 31 Dec - 23:08

mooikite.

**malena stool** Sun 2 Jan - 23:04

Nickel

**Alpine Aster** Wed 5 Jan - 21:19

Omphacite.

**malena stool** Sat 8 Jan - 23:55

Platinum

**Alpine Aster** Sun 9 Jan - 12:58

Quartz.

**malena stool** Sun 9 Jan - 20:03

Romanechite

**Alpine Aster** Sun 16 Jan - 14:41

Smithsonite.

**Alpine Aster** Sun 16 Jan - 14:41

Double Posted! I don't know why oppppppppppps.

**malena stool** Sun 16 Jan - 23:37

Realgar

**Alpine Aster** Tue 22 Feb - 18:39

Strontianite.

**malena stool** Fri 25 Feb - 21:42

Tantalite

**Alpine Aster** Wed 2 Mar - 22:34

Uraninite.

Guest Wed 2 Mar - 22:51

valentinite

**malena stool** Thu 3 Mar - 9:46

Wardite

**Alpine Aster** Sat 19 Mar - 21:54

Xenotime.

**malena stool** Tue 29 Mar - 23:45

Yuksporite.

**Alpine Aster** Tue 3 May - 19:39

Zoisite.

**AnnaEsse** Tue 3 May - 19:50

Agate

**malena stool** Thu 5 May - 21:12

Bismuth

**Angelique** Sat 9 Jul - 2:43

Calcium

It is the chemical element with the symbol Ca and atomic number 20. It has the atomic mass of 40,078 amu.
Calcium is a soft grey alkaline earth metal and is the fifth most abundant mass in the Earth's crust. Calcium is also the fifth most abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium and sulphate.

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