Question

Horn Silver is:
1. Carbonate mineral
2. Chloride mineral
3. Sulphate mineral
4. Phosphate mineral

Answer 1

Hint: Chlorargyrite is a mineral of $AgCl$ ( silver ore ) and as it is polished by desert wind and dust to the dull luster of a cow horn, hence the name "horn silver" is given to the compound.

Step by step answer: Cerargyrite, also called Horn Silver, gray, very heavy halide mineral composed of silver chloride ($AgCl$), it is an ore of silver. It forms a complete solid-solution series with bromyrite, silver bromide ($AgBr$), in which bromine completely replaces chlorine in the crystal structure. These are secondary minerals that commonly occur as alteration products of native silver, silver sulfides, and sulfo salts in silver deposits that have been oxidized by weathering. They are often found as crusts, coatings, or horn like masses with native silver, and limonite and are common in Germany, Chile, and the western United States.
Chlorargyrite is the mineral form of silver chloride ($AgCl$). It is also known as cerargyrite and, when weathered by desert air, as horn silver
As it is made up of silver chloride ($AgCl$) so it is a chloride mineral.

So the correct option is 2nd.

Note: Horn Silver (Silver chloride) consists of 24.7 percent chlorine and 75.3 percent silver, but cerargyrite often contains, in addition to its essential constituents, some mercury, bromine and occasionally some iodine. Colors: White, gray, yellowish, sometimes colorless.