Ringwoodite A water-bearing mineral found in Earth's mantle transition zone. (more) ringwoodite mineral Written by Divya Dubey Divya Dubey is an editor at Britannica, focusing on Chemistry content. Divya Dubey Fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Mar. 31, 2026 •History ringwoodite, magnesium-iron silicate mineral with the chemical formula (Mg, Fe)2SiO4. It is a polymorph (a mineral with the same composition but a different crystal structure) of the rock-forming mineral olivine. Ringwoodite forms under high-pressure conditions and is therefore denser than other polymorphs of olivine. Although olivine occurs on Earth’s surface as the green gemstone peridot, ringwoodite is typically blue and occurs deep within Earth, at depths of about 410 to 660 km (250 to 410...

　　.eb-448-paywall-overlay { position: relative; background: white; border: 2px solid #93c5fd; border-radius: 16px; text-align: center; box-shadow: 0 4px 8px 0px #bfdbfe; width: 100%; overflow: hidden; } .eb-448-paywall-overlay-padding { padding: 40px 48px; } .eb-448-paywall-simple { border: 2px solid #93c5fd; } .eb-448-decorative-left-simple, .eb-448-decorative-right-simple { position: absolute; top: 50%; transform: translateY(-50%); } .eb-448-decorative-left-simple { left: 0px; transform: translateY(-50%) scaleX(-1); } .eb-448-paywall-simple .eb-448-decorative-right-simple { right: 0; } .eb-448-paywall-content { position: relative; z-index: 15; } .eb-448-header-section { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 8px; } .eb-448-features { display: flex; justify-content: center; align-items: center; gap: 12px; margin-bottom: 32px; font-size: 14px; color: #525252; } .eb-448-features-simple { color: #6b6b6b; } .eb-448-feature-free-trial { display: flex; align-items: center; gap: 12px; color: black; } .eb-448-feature-secondary { display: flex; align-items: center; gap: 12px; } .eb-448-feature { font-weight: 600; } .eb-448-feature.simple { font-weight: 400; } .eb-448-feature.bold { color: balck; font-weight: 700; } .eb-448-feature.blue { color: #14599d; } .eb-448-divider { color: #cbd5e0; font-weight: 300; } .eb-448-unsubscribe-text { color: #525252; margin-bottom: 8px; font-size: 14px; font-weight: 600; } .eb-448-unsubscribe-text-simple { font-weight: 400; color: #6b6b6b; } .eb-448-decorative-left { position: absolute; top: 0; left: 0; height: 100%; z-index: -1; } .eb-448-decorative-right { position: absolute; right: 0; top: 0; height: 100%; } .eb-448-decorative-image { height: 100%; } .eb-448-decorative-mobile { width: 100%; display: none; img { width: 100%; } } @media (max-width: 672px) { .eb-448-features { gap: 8px; font-size: 12px; } .eb-448-unsubscribe-text { font-size: 12px; } .eb-448-decorative-left, .eb-448-decorative-right { display: none; } .eb-448-decorative-mobile { display: flex; } .eb-448-paywall-overlay-padding { padding: 20px 24px; } .eb-448-features-simple { flex-direction: column; } .eb-448-feature-free-trial .eb-448-divider { display: none; } .eb-448-thistle-icon { filter: blur(2px); } }

　　Discover the world with Britannica Subscribe to Continue Reading Free Trial | No Ads | Exclusive Content Unsubscribe Anytime!

　　Explore Subscriptions