{"product_id":"red-cap-amethyst","title":"Red cap Amethyst","description":"\u003cp\u003eThis striking red cap amethyst specimen showcases a bold contrast between deep iron-rich surface coatings and underlying amethyst crystal growth. The upper section features a rugged, earthy red matrix, while the lower areas reveal clusters of purple amethyst crystals, creating a visually dynamic piece that highlights multiple stages of mineral formation within a single specimen.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eLeft in its natural, unpolished state, this piece preserves the raw textures and structural complexity formed over time. The contrast between the iron-stained quartz and the amethyst crystal pockets gives it a layered, almost brecciated appearance, making it both scientifically interesting and visually distinctive from every angle.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e🔍 Key Features\u003cbr\u003eMaterial: Natural amethyst (quartz) with iron-rich “red cap” formation\u003cbr\u003eFormation: Natural crystal cluster with iron oxide coating and secondary amethyst growth\u003cbr\u003eColour: Deep red\/brown surface tones with purple amethyst and milky quartz\u003cbr\u003eCrystal Habit: Macrocrystalline quartz with druzy crystal formations\u003cbr\u003eFinish: Natural, unpolished exterior\u003cbr\u003eShape: Irregular natural formation with exposed crystal pockets\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e📏 Dimensions\u003cbr\u003eApprox. Size: 5.6cm x 4.8cm\u003cbr\u003eWeight: 56 grams\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e🌍 Geological \u0026amp; Scientific Notes\u003cbr\u003eRed cap amethyst forms when quartz crystals are exposed to iron-rich environments during or after their growth. The red to brown surface layer is typically caused by iron oxides (such as hematite or limonite) that coat or infuse the outer crystal surfaces.\u003cbr\u003eIn this specimen, the underlying amethyst formed first within a cavity or vein under hydrothermal conditions, where silica-rich fluids slowly crystallised into quartz. Later exposure to iron-bearing solutions or surrounding sediment introduced the distinctive red coating, creating the “red cap” effect.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe presence of both amethyst crystal growth and iron-rich matrix in one piece provides a clear example of multi-stage mineral formation. Quartz crystallises in the trigonal system, typically forming hexagonal prisms, though here the growth is expressed as clustered and intergrown crystals.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e🧪 Mineral Information\u003cbr\u003eMineral: Quartz (Amethyst variety)\u003cbr\u003eFormula: SiO₂\u003cbr\u003eColour: Purple (amethyst) with red\/brown iron oxide coating\u003cbr\u003eCause of Colour: Iron impurities and natural irradiation (amethyst); iron oxides (red cap)\u003cbr\u003eLustre: Vitreous (glassy) on crystal faces, earthy on matrix\u003cbr\u003eTransparency: Transparent → translucent → opaque (matrix)\u003cbr\u003eStreak: White\u003cbr\u003eHardness: 7 (Mohs)\u003cbr\u003eFracture: Conchoidal\u003cbr\u003eCleavage: None\u003cbr\u003eDensity: ~2.65\u003cbr\u003eCrystal System: Trigonal\u003cbr\u003eHabit: Crystal clusters and druzy formations\u003cbr\u003eFormation: Hydrothermal veins and cavities with secondary mineralisation\u003cbr\u003eCommon Locations: Brazil, India, Uruguay, Madagascar\u003cbr\u003e🔬 Optical\u003cbr\u003eRefractive Index: ~1.54–1.55\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e✨ Extras\u003cbr\u003eDistinct contrast between iron-rich outer layer and amethyst crystals\u003cbr\u003eDisplays multiple stages of mineral growth in one specimen\u003cbr\u003eNatural textures and crystal pockets create visual depth\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e📦 Condition\u003cbr\u003eNatural, unpolished specimen\u003cbr\u003eSurface texture and irregularities typical of raw mineral formation\u003cbr\u003eMinor inclusions and matrix material present\u003cbr\u003eNo visible dyeing or artificial enhancement\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e🧼 Care Instructions\u003cbr\u003eHandle carefully to protect delicate crystal points\u003cbr\u003eClean gently with a soft brush (avoid soaking)\u003cbr\u003eAvoid harsh chemicals\u003cbr\u003eStore separately to prevent damage to crystal surfaces\u003c\/p\u003e","brand":"Crystal Ballerz","offers":[{"title":"Default Title","offer_id":53737670050133,"sku":null,"price":25.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1039\/9295\/1125\/files\/rn-image_picker_lib_temp_45a5e3f8-1b7f-49c3-9c4c-ea4de9d1eb15.jpg?v=1776787919","url":"https:\/\/crystalballerz.co.uk\/products\/red-cap-amethyst","provider":"Crystal Ballerz","version":"1.0","type":"link"}