Calcite And Aragonite CaCO

FIG. 172 CALCITE AND ARAGONITE CaCO,

COMPOUNDS CALCITE AND ARAGONITE Ca CO,

Both Calcite and Aragonite are crystalline forms of Calcium Carbonate. In the form given in Fig. 172, the three Oxygen atoms radiate horizontally. The Calcium centre, Ca80. with the four Anu from the Carbon atom, forms the centre as before. The four Calcium funnels break up. Each funnel, Cal60. contains three spheres, so we have 12 spheres in all. These arc accounted for by the 12 spheres, four round each Oxygen atom. The eight funnels of the Carbon are placed symmetrically round the centre.

COPPER HYDROXIDE Cu(OH),

FIG. 173. COPPER HYDROXIDE Cu(OH).

COPPER HYDROXIDE Cu(OH)

Copper Hydroxide is somewhat like a flat mango. Fig. 173. The Copper atom, which is dumb-bell in shape, stands in the middle. Its central rod is thin and elongated and from its ends the twelve funnels radiate from the globes. Cu20. As the funnels are fairly heavy they are long and extend to some distance. Under the radiating funnels there appears on either side of the dumb-bell bar, a Hydroxyl group, just as if when an umbrella is opened there is the central stick but under the cover of the umbrella two groups.

The whole makes a very beautiful form.

SULPHURIC ACID H2SO,

SULPHURIC ACID H,SO.

The Sulphur atom is a tetrahedron having four funnels each containing nine S.16 in a ring. In the compound H,SO, the Oxygen atoms seem to have acted in their usual manner and broken up the Sulphur atom to some extent They have pushed themselves into the centre and pushed out the funnels. Each of the four Oxygen atoms radiates from the face of a tetrahedron. At the end of each Oxygen snake is a funnel of Sulphur, and over the mouth of the funnel floats half a Hydrogen atom.

In Fig. 174 only three sides of the tetrahedron are shown, the fourth being concealed. This must be imagined at the back, making up the constituents of H,SO«.

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