On Earth, gold is found in ores in rock formed from the Precambrian time onward. It most often occurs as a native metal, typically in a metal solid solution with silver (i.e. as a gold silver alloy). Such alloys usually have a silver content of 8â10%. Electrum is elemental gold with more than 20% silver.
Grammar note Expand. Abbreviation is the most widely used term for a shortened or contracted form of a word or phrase. Abbreviations of single words are typically formed using the first letter or letters of the word (n. = noun; adj. = adjective), the first letter and the last letter (hr.
An acronym (pronounced AK-ruh-nihm, from Greek acro-in the sense of extreme or tip and onyma or name) is an abbreviation of several words in such a way that the abbreviation itself forms a pronounceable word. The word may already exist or it can be a new word. An acronym is an abbreviation that forms a word. 2  An initialism is an abbreviation that uses the first letter of each word in the phrase (thus, some but not all initialisms are acronyms).