From malach; properly, powder, i.e. (specifically) salt (as easily pulverized and dissolved -- salt((-pit)).
see HEBREW malach
H4417. melach
II. מֶ֫לַח noun masculine salt (Late Hebrew id.; Arabic ; Aramaic , מִלְחָא); — ׳מ absolute Genesis 19:26 +; construct Leviticus 2:13; — salt for seasoning food Job 6:6; offering Leviticus 2:13 (3 t. in verse) compare Ezekiel 43:24; מֶ֫לַח בְּרִית Numbers 18:19; 2 Chronicles 13:5 (compare Leviticus 2:13 see Di); used in purifying waters 2 Kings 2:20-21, strewn on site of devoted city Judges 9:45 compare Zephaniah 2:9 (׳מִכְרֵהמֿ) Deuteronomy 29:22 ("" גָּפְרִית); produced in marshes reserved for purpose Ezekiel 47:11; pillar of salt מ ׳נְצִיב Genesis 19:26; usually in combination (ֿׅ יָם הַמֶּלַח 14:3 (הַשִּׂדִּים עֶ֫מֶק), Numbers 34:3, 12; Deuteronomy 3:17 ("" הָעֲתָבָה יָם), Joshua 3:16; 12:3; 15:2, 5; 18:19; also ׳גֵיאמֿ 2 Samuel 8:13; 2 Kings 14:7 Qr, Psalm 60:2 (title), הַמּ ׳גֵּיא 1 Chronicles 18:12; 2 Chronicles 25:11; 2 Kings 14:7 Kt.