Whewellite

Whewellite

Whewellite is a mineral that belongs to the oxalate group. It was first discovered in 1823 by William Whewell, an English scientist and philosopher, after whom the mineral was named. Whewellite is known for its unique crystal structure and its occurrence in various geological environments.

Physical Properties

Whewellite typically forms as small, colorless to white crystals. It has a vitreous to pearly luster and a transparent to translucent appearance. The mineral has a Mohs hardness of 2.5 to 3, which means it is relatively soft. Its specific gravity ranges from 1.6 to 1.7.

Chemical Composition

The chemical formula of Whewellite is CaC2O4·H2O, indicating that it consists of calcium (Ca), oxalate (C2O4), and water (H2O). It is classified as a calcium oxalate hydrate. Whewellite is closely related to another mineral called weddellite, which has the same chemical composition but a different crystal structure.

Formation and Occurrence

Whewellite is commonly found in various geological environments, including sedimentary rocks, hydrothermal veins, and volcanic deposits. It often occurs as a secondary mineral formed through the weathering and alteration of primary minerals containing calcium. Whewellite can also be found in caves, where it forms as a result of the interaction between calcium-rich water and organic matter.

Uses

Whewellite does not have any significant commercial uses. However, it is of interest to mineral collectors and researchers due to its unique crystal structure and its occurrence in various geological settings. Its presence in caves can also provide valuable information about the geological history and processes that have taken place in those environments.

References

1. "Whewellite". Mindat.org. Retrieved 2022-05-01.

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See Also

• Oxalate
• Mineralogy
• Crystal Structure