Indian Brinaite gemstone, 38.712 carats

Technical details: Type: Prehnite Weight: 38.712 carats Dimensions (mm): 30.40x18.43x8.79 Shape: Pear Color: Dark green Clarity: Eye-clean Transparency: Opaque Hardness: 6.0-6.5 Treatment: Untreated Origin: India Certification: Certificate from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Prehnite is a calcium aluminum silicate mineral. This stone is known for its light yellowish-green or apple-green color, and sometimes appears white, gray, or yellow. Prehnite features a glassy to greasy luster, often forming in botryoidal or nodular clusters with smooth, rounded surfaces, or as small mosaic crystals. Prehnite is usually found as a secondary mineral in cavities and cracks within basic igneous rocks such as basalt and diabase, and is often associated with other minerals like zeolites and calcite.