Galápagos Beaches: Black, White, Green & Red Sands of Volcanic Origin

The Galápagos doesn't do generic beige. Its beaches are mineralogical fingerprints of volcanic geology:

1. Black Sand — The Baseline

• Source: Basaltic lava → mechanical erosion → glassy shards rich in Fe/Mg
• Ubiquitous: All major islands (Santa Cruz, Isabela, Fernandina, Santiago)
• Thermal: Absorbs heat — nests of green turtles (Chelonia mydas) warmer, faster incubation

2. White Sand — Coral & Foraminifera

• Source: Calcium carbonate skeletons (corals, red algae, forams, mollusks)
• Locations: Sheltered coves, leeward shores (Tortuga Bay, Gardner Bay, Post Office Bay)
• Biology: High carbonate saturation → active reef growth nearby

3. Green Sand — Olivine Crystals (Rare)

• Source: Olivine-rich basalt (mantle xenoliths) → weathering releases gemmy green grains
• Only at: Punta Cormorant, Floreana Island — "Green Beach"
• Mineral: (Mg,Fe)₂SiO₄ — peridot gem quality in places

4. Red Sand — Oxidized Iron (Rare)

• Source: Palagonitized tuff (hydrothermally altered ash) → hematite staining
• Only at: Rabida Island (Jervis) — "Red Beach"
• Contrast: Stark against turquoise water; sea lion colony

Protection & Tourism

• Galápagos Marine Reserve (1998) — 133,000 km²; no extraction, guided visits only
• Visitor rules: No touching wildlife, stay on marked trails, no sand/shell collection
• Best access: Live-aboard cruise (7–10 days) or day boats from Santa Cruz/San Cristóbal

Four colors, four origin stories — all on one archipelago. The beaches are the geology lesson.