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@hydromo.bsky.social Oct 7, 2026, 1:39 PM

Manganosite — 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

Manganosite specimen (AI-generated image), RockSpin

@hydromo.bsky.social Oct 5, 2026, 9:58 PM

Cassiterite — 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

Cassiterite specimen (AI-generated image), RockSpin

@hydromo.bsky.social Oct 3, 2026, 7:04 PM

Chamosite — 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

Chamosite specimen, AI-generated, landscape

@hydromo.bsky.social Sep 30, 2026, 5:06 PM

Azurite (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.social Sep 29, 2026, 11:38 PM

Fluorite (CaF₂) — colorful cubic crystals. Spinning CaF₂ lattice (Fm-3m).

Explore crystal structures in RockSpin:
apps.apple.com/us/app/rocks...

#Fluorite #CrystalStructure #RockSpin #CIF

@hydromo.bsky.social Sep 28, 2026, 9:16 PM

Gypsum (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.social Sep 28, 2026, 7:13 PM

Halite (NaCl) — rock salt. Spinning cubic NaCl lattice (Fm-3m).

Explore crystal structures in RockSpin:
apps.apple.com/us/app/rocks...

#Halite #RockSalt #CrystalStructure #RockSpin #CIF

@hydromo.bsky.social Sep 28, 2026, 3:06 AM

Pyrite (FeS₂) — cubic lattice / “fool’s gold.” Face-centered Fe with S–S dumbbells → cubes & pyritohedra. Brassy, metallic, Mohs ~6–6.5.

CIF structure still.

apps.apple.com/us/app/rocks...

#Pyrite #CrystalStructure #Mineralogy #RockSpin #CIF

@hydromo.bsky.social Sep 28, 2026, 2:56 AM

Calcite (CaCO₃) — limestone, marble, cave formations. Fizzes with dilute HCl. Mohs 3, rhombohedral cleavage.

Specimen image: AI-generated.

apps.apple.com/us/app/rocks...

#Calcite #Minerals #Geology #RockSpin

@hydromo.bsky.social Sep 26, 2026, 7:32 AM

Quartz (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