Least resistant mineral to weathering is

✅Explanation: Olivine is a primary mineral that is highly susceptible to weathering due to its chemical composition. It is an iron-magnesium silicate and readily reacts with water and oxygen, leading to its breakdown.

✏️Other Options Explanations:
-Option A: Quartz: Quartz is known for its high resistance to weathering due to its strong chemical bonds and lack of cleavage planes.
-Option C: Geothite: Geothite is an iron oxide-hydroxide mineral that is relatively resistant to weathering. It is often formed as a result of the weathering of other iron-bearing minerals.
-Option D: Anorthite: Anorthite is a plagioclase feldspar mineral. While susceptible to weathering, it is generally more resistant than olivine due to its more complex structure.