Vanadomalayaite
Chemical formula: CaV⁴⁺OSiO₄
Vanadomalayaite is a rare calcium vanadium silicate, distinguished by its intense red color and strong, almost adamantine luster.
Properties
- Mohs hardness
- 6
- Luster
- Adamantine
- Streak
- White
- Density
- 3.60
- Cleavage
- {110}
- Fracture
- Uneven
- Transparency
- Transparent
- Crystal system
- Monoclinic
Diagnostic features
## Identification Key features for identifying vanadomalayaite are its intense, deep red color, very strong adamantine luster, and characteristic forms of small, tabular crystals. Co-occurrence with other vanadium minerals in a specific geological environment is also an important clue. ## Distinguishing from Similar Minerals It can be confused with some red garnets (e.g., pyrope), which, however, crystallize in the isometric system and usually have a vitreous, not adamantine, luster. Eudialyte can be similar in color but has a lower hardness (5-5.5) and occurs in a different geological environment (nepheline syenites). Zincite can also have a red color and similar hardness but is significantly denser (density ~5.6 g/cm³). ## Crystal Forms It most commonly forms small, flattened, tabular crystals with a prismatic habit. These crystals often occur as radial or star-shaped clusters and aggregates, growing on the host rock.
Geological environment
## Genesis Vanadomalayaite is a hydrothermal mineral. It forms under low-temperature conditions in calcite-quartz veins cutting through manganese- and vanadium-rich rocks, such as radiolarites (a type of siliceous sedimentary rock). ## Mineral Associations This mineral co-occurs with minerals such as quartz, calcite, braunite, pyroxmangite, saneroite, ganophyllite, and other rare vanadium and manganese minerals. ## Localities The most important and typical locality for vanadomalayaite is the Gambatesa manganese mine in Liguria, Italy. This is the primary and practically sole location from which well-formed, collectible specimens of this mineral originate.
Rarity
Very rare
For collectors
## Quality Criteria The most highly prized vanadomalayaite specimens are characterized by sharp, well-formed crystals of intense, deep red color and strong luster. Rich groups of crystals forming radial aggregates on a light, contrasting quartz matrix are particularly sought after. The size of individual crystals rarely exceeds a few millimeters, so the size and richness of the aggregate are key factors influencing value. ## Popular Localities The only source of valuable collector specimens is the historical type locality – the Gambatesa mine in Italy. Specimens from this location are considered classics and serve as a benchmark for this mineral.
Care and storage
## Cleaning Specimens should be cleaned mechanically only, using a soft brush to remove dust. If necessary, compressed air can be used. Due to the mineral's rarity, contact with water and all chemicals should be avoided. ## What to Avoid Avoid ultrasonic cleaners, chemical agents (acids, bases, solvents), and sudden temperature changes. Despite a hardness of 6, it should be protected from contact with harder minerals (e.g., quartz) to prevent scratches. ## Storage Vanadomalayaite should be stored in a separate, padded display box, away from other minerals. It should be protected from dust, moisture, and direct, prolonged exposure to sunlight.