While there isn't one single person who definitively classified all minerals based on their chemical composition, James Dwight Dana is widely credited for establishing a comprehensive and influential system for mineral classification that heavily relied on chemical composition.

Here's a breakdown:

* James Dwight Dana (1813-1895): He was a prominent American mineralogist who, in 1837, published his "System of Mineralogy," which introduced a classification scheme based on the chemical composition of minerals. He organized them into classes (e.g., oxides, sulfides, silicates) and further subdivided them based on their specific chemical formulas. This work became a standard reference for mineralogists and continues to influence modern classification systems.

* Other Contributions: While Dana's system was foundational, other scientists continued to refine and expand upon it over time. Notable figures include:

* Wilhelm Karl Ritter von Haidinger (1795-1871): He developed a classification system based on crystallographic characteristics, which complemented Dana's chemical approach.

* August Breithaupt (1791-1873): He proposed a classification system based on physical properties, including hardness and color.

It's important to remember that mineral classification is an ongoing process. Modern mineralogists continue to refine classification systems, incorporating new analytical techniques and updated knowledge about mineral compositions and structures.