Vivianite Naturally Terminated Minerios Brazil 240g

Mineral Name: Vivianite Chemical Formula: Fe3(PO4)2 · 8H2O Color: Vivianite exhibits a wide range of colors, including deep blue, blue-green, green, and rarely brown. The coloration is often attributed to impurities and varying oxidation states of iron within the crystal lattice. Crystal System: Monoclinic Hardness: 1.5 - 2 on the Mohs scale Luster: Subadamantine to vitreous Transparency: Transparent to translucent Specific Gravity: 2.66 - 2.68 Cleavage: Perfect cleavage in one direction Fracture: Uneven Streak: Pale blue to blue-green Occurrences: Vivianite is commonly found in sedimentary environments, particularly in areas with low-oxygen conditions, such as bog iron ore deposits and phosphate-rich sediments. It can also be associated with organic material and is often discovered in locations with decomposing organic matter. Notable Localities: Notable occurrences of vivianite include Bolivia, Brazil, Germany, the United States (especially in North Carolina and Virginia), and Russia. Formation: Vivianite forms as a secondary mineral through the alteration of primary phosphate minerals under reducing conditions. The precipitation of vivianite is often facilitated by the presence of organic material, iron, and phosphorus-rich environments. Over time, these conditions contribute to the development of the distinctive crystal structure. Unique Features: Vivianite is renowned for its stunning blue and green coloration, which can vary depending on factors such as exposure to light and the presence of impurities. The crystals often have a prismatic habit with well-defined faces and a bright luster. Due to its sensitivity to light and air, vivianite specimens should be handled and stored with care to preserve their vibrant colors. Uses: While vivianite is primarily valued as a collector's mineral due to its beautiful colors and crystal forms, it has also been used historically for its phosphorus content. In some cases, vivianite has been utilized as a source of phosphorus in the production of fertilizers. Caution: Vivianite is a relatively soft and fragile mineral, susceptible to damage from handling and exposure to light. It is advisable to store specimens in a dark and dry environment to maintain their color and overall integrity. Additionally, contact with acids should be avoided as it can lead to dissolution of the mineral.