Earth rocks solidify rapidly inside oxygen- and water-rich crust. By contrast, Moon basalts crystallize in bone-dry vacuum (yielding IMA 2025/2026 Magnesiochangesite-(Y)), asteroid cores cool 1°C per million years to lock symmetrical Widmanstätten Kamacite/Taenite plates, and hypervelocity impacts squeeze ordinary beach sand into ultra-dense Coesite and Stishovite in microseconds.
Discovered in lunar regolith returned by Chang'E-5 and officially documented in recent IMA CNMNC circulars, Magnesiochangesite-(Y) ((Ca₈Y)□Mg(PO₄)₇) concentrates rare-earth Yttrium inside bone-dry late-stage lunar basalt pockets. Zero atmospheric water preserves pristine reduced phosphorus chemistry.
Below ~700°C inside a parent asteroid core, homogeneous fcc taenite exsolves bcc kamacite along {111} crystal planes. At 1–10°C/Myr cooling rates, nickel diffusion builds crisp millimeter-wide geometric triangles revealed immediately by dilute nitric acid in alcohol (Nital).
Slicing open Brenham, Esquel, or Fukang pallasites exposes amber-green magnesium-rich olivine (forsterite) suspended directly in solid nickel-iron. Backlit slices glow like stained glass formed at the boundary between a destroyed mini-planet's rocky mantle and liquid metal heart.
Blast-furnace iron slag looks melted and dark brown, and sticks to magnets—fooling thousands of treasure hunters yearly. Yet slag stays riddled with frozen CO₂ gas pockets, holds under 0.1% nickel (zero DMG pink reaction), and completely lacks Widmanstätten planes or rounded metallic chondrules.
| Specimen | Primary Crystals / Chemistry | Specific Gravity | Diagnostic Test Result |
|---|---|---|---|
| Iron Octahedrite (Gibeon) | Kamacite + Taenite (Fe-Ni, 6–14% Ni) | 7.80–7.95 | 60° Widmanstätten bands on Nital etch + DMG pink |
| 2026 Lunar Magnesiochangesite-(Y) | (Ca₈Y)□Mg(PO₄)₇ + Anorthite + Ilmenite | 3.15–3.35 | Waterless OH⁻-free phosphate; 0.00 H₂O alteration |
| Pallasite (Esquel / Fukang) | Forsterite Olivine (Mg₂SiO₄) in Fe-Ni | 4.70–5.50 | Translucent yellow-green peridot in solid steel matrix |
| Mars Jarosite | KFe³⁺₃(SO₄)₂(OH)₆ hydrous sulfate | 3.10–3.25 | Proves ancient acidic Martian brines evaporated |
| Shock Coesite / Stishovite | High-pressure SiO₂ (octahedral Si in Stishovite) | 2.92 / 4.29 | Created solely by asteroid crater shockwaves (>10 GPa) |
| Smelter Slag (Meteorwrong) | Silicate glass + metallic Fe⁰ blebs (<0.1% Ni) | 2.80–3.80 | Circular gas bubbles; FAILS DMG nickel swab & acid etch |
Recognized by the IMA in 2025/2026 from Chang'E-5 lunar regolith, Magnesiochangesite-(Y) crystallizes inside anhydrous, oxygen-depleted lunar magmas. Because the Moon lacked oceans and free atmospheric oxygen during late basalt cooling, rare-earth phosphates freeze cleanly instead of weathering into hydrated clays.
Never convincingly in true 3D crystal depth. Kamacite/taenite exsolution across millimeter plates requires cooling rates around 1–10°C per million years. Etching an authentic slice exposes uniform grain orientations aligned across cut faces.
Almost every iron and stony-iron meteorite carries 5% to 35% cosmic nickel alloyed with iron, whereas commercial pig iron, foundry slag, hematite, and magnetite contain practically none. A drop of ammoniacal DMG turns brilliant raspberry-pink within 5 seconds on genuine meteoritic nickel.
When the Ries asteroid slammed into Bavaria 14.8 million years ago, superheated silicate vapor splashed hundreds of kilometers eastward and quenched mid-air into emerald bottle-green tektite glass containing lechatelierite (melted pure quartz) wires and near-zero trapped water (<0.01%).