Martinite
Martinite is a rare borosilicate mineral with the chemical formula (Na,☐,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2O. It belongs to the triclinic crystal system and is classified under the Strunz system as 9.EE.80. The mineral is typically colorless to white in appearance and exhibits a vitreous luster. It is relatively soft, with a hardness of approximately 4 to 4.5 on the Mohs scale, and has a low to moderate density. Martinite is notable for its complex chemical composition, which includes a combination of silicon, boron, and sulfur in its structure, making it a unique member of the borosilicate mineral group.
Composition
- OOxygen43.9%
- SiSilicon24.5%
- NaSodium17.2%
- CaCalcium10.0%
- FFluorine2.4%
- BBoron1.3%
- HHydrogen0.6%
Overview
Martinite is a rare borosilicate mineral with the chemical formula (Na,☐,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2O. It belongs to the triclinic crystal system and is classified under the Strunz system as 9.EE.80. The mineral is typically colorless to white in appearance and exhibits a vitreous luster. It is relatively soft, with a hardness of approximately 4 to 4.5 on the Mohs scale, and has a low to moderate density. Martinite is notable for its complex chemical composition, which includes a combination of silicon, boron, and sulfur in its structure, making it a unique member of the borosilicate mineral group.
Etymology
Martinite is named after Robert F. Martin, in recognition of his contributions to mineralogy.
How to recognize it
Martinite can be identified by its colorless to white color and vitreous luster. It has a hardness of approximately 4 to 4.5 on the Mohs scale, which is relatively soft. The mineral does not exhibit a distinct streak and has a low to moderate density. Due to its rarity and complex composition, it is often confused with other borosilicates, but its triclinic crystal system and unique chemical formula help distinguish it.
Trivia
Martinite is notable for its complex chemical formula, which includes a combination of silicon, boron, and sulfur. It is part of the rare and chemically diverse borosilicate mineral group. Additionally, its triclinic crystal system is less common among minerals, adding to its scientific interest.