@hydromo.bsky.socialFluorapatite — Ca₅(PO₄)₃F, hexagonal apatite (P6₃/m). Main industrial P for fertilizer; F end-member vs bone hydroxylapatite.
Green–blue–yellow–violet, vitreous, Mohs 5. Spin below.
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Fluorapatite #Minerals #RockSpin
@hydromo.bsky.socialLeucite — KAlSi₂O₆, a feldspathoid of potassium-rich, silica-poor lavas (Vesuvius). Its "cubic" crystals go tetragonal on cooling.
White–grey, vitreous, Mohs 5.5–6.
Spin below.
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Leucite #Minerals #RockSpin
@hydromo.bsky.socialVermiculite — (Mg,Fe,Al)₃(Si,Al)₄O₁₀(OH)₂·4H₂O, a weathered mica that holds water. Heated, it puffs into worm-like strands.
Bronze-brown, pearly, Mohs 1.5–2.
Swipe for the spin.
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Vermiculite #Minerals #RockSpin
@hydromo.bsky.socialMarcasite — FeS₂, an iron sulfide with pyrite's formula but orthorhombic crystals. Forms in cool, acidic shale and coal.
Pale bronze-yellow, metallic, Mohs 6–6.5.
Swipe for the spin.
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Marcasite #Minerals #RockSpin
@hydromo.bsky.socialManganosite — MnO, manganese(II) oxide. Cubic rocksalt-type; green to black. Rare in reducing Mn deposits.
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Manganosite #Minerals #RockSpin
@hydromo.bsky.socialCassiterite — SnO₂, primary tin ore. Brown–black, adamantine–greasy, Mohs ~6–7; dense (~7).
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Cassiterite #Minerals #RockSpin
@hydromo.bsky.socialChamosite — Fe-rich chlorite ((Fe,Mg)₅Al(Si₃Al)O₁₀(OH)₈). Olive green sheets in low-grade rocks & ironstones. Mohs ~2–3; perfect {001}. Specimen image: AI-generated. https://apps.apple.com/us/app/rockspin/id6747876962 #Chamosite #Minerals #RockSpin
@hydromo.bsky.socialAzurite (Cu₃(CO₃)₂(OH)₂) — deep azure copper carbonate from oxidized copper ores. Vitreous luster, Mohs 3.5–4; often alters to green malachite.
Specimen image: AI-generated.
https://apps.apple.com/us/app/rockspin/id6747876962
#Azurite #Minerals #RockSpin
@hydromo.bsky.socialFluorite (CaF₂) — colorful cubic crystals. Spinning CaF₂ lattice (Fm-3m).
Explore crystal structures in RockSpin:
apps.apple.com/us/app/rocks...
@hydromo.bsky.socialGypsum (CaSO₄·2H₂O) — soft evaporite behind plaster & drywall. Forms when Ca/sulfate waters evaporate in arid basins. Mohs 2, perfect cleavage.
Specimen image: AI-generated.
apps.apple.com/us/app/rocks...
#Gypsum #Minerals #RockSpin
@hydromo.bsky.socialHalite (NaCl) — rock salt. Spinning cubic NaCl lattice (Fm-3m).
Explore crystal structures in RockSpin:
apps.apple.com/us/app/rocks...
@hydromo.bsky.socialPyrite (FeS₂) — cubic lattice / “fool’s gold.” Face-centered Fe with S–S dumbbells → cubes & pyritohedra. Brassy, metallic, Mohs ~6–6.5.
CIF structure still.
@hydromo.bsky.socialCalcite (CaCO₃) — limestone, marble, cave formations. Fizzes with dilute HCl. Mohs 3, rhombohedral cleavage.
Specimen image: AI-generated.
@hydromo.bsky.socialQuartz (SiO₂) — Earth’s most common crystal, easiest to start with.
Late from silica-rich magma; fills veins; weathers into sand. Glass, chips, clocks.
Clear–milky, glassy, Mohs 7.
Specimen image: AI-generated.
apps.apple.com/us/app/rocks...
#RockSpin #Quartz #Mineralogy
