Kristal
Rhodonite
Rhodonite • piroksenoid — idealisasi (Mn,Fe,Mg,Ca)SiO₃ (Mn-dominan) Sistem kristal: Triklinik • Kebiasaan: masif, granular, potongan sing bisa dipisah; kristal prismatik langka Mohs: ~5.5–6.5 • SG: ~3.4–3.7 • Cleavage: sempurna ing...
Rhodonite
Rhodonite • piroksenoid — idealisasi (Mn,Fe,Mg,Ca)SiO₃ (Mn-dominan) Sistem kristal: Triklinik • Kebiasaan: masif, granular, potongan sing bisa dipisah; kristal prismatik langka Mohs: ~5.5–6.5 • SG: ~3.4–3.7 • Cleavage: sempurna ing...
Rhodochrosite
Rhodochrosite • MnCO₃ — mangan karbonat (klompok kalsit) Sistem kristal: Trigonal (rhombohedral) • Bentuk: rhombohedra, scalenohedra, pita botryoidal & stalaktitik Mohs: ~3.5–4 • SG: ~3.5–3.7 • Pecahan: rhombohedral sampurna ing...
Rhodochrosite
Rhodochrosite • MnCO₃ — mangan karbonat (klompok kalsit) Sistem kristal: Trigonal (rhombohedral) • Bentuk: rhombohedra, scalenohedra, pita botryoidal & stalaktitik Mohs: ~3.5–4 • SG: ~3.5–3.7 • Pecahan: rhombohedral sampurna ing...
Kuarsa
Quartz • SiO₂ • Tectosilicate (framework silicate) Sistem kristal: Trigonal (α‑quartz) • Kebiasaan: prismatik karo piramida Kekerasan ~7 • SG ~2.65 • Kilap: vitreous • Pemecahan: ora ana Optik: Uniaxial...
Kuarsa
Quartz • SiO₂ • Tectosilicate (framework silicate) Sistem kristal: Trigonal (α‑quartz) • Kebiasaan: prismatik karo piramida Kekerasan ~7 • SG ~2.65 • Kilap: vitreous • Pemecahan: ora ana Optik: Uniaxial...
Pyrite
Pyrite • FeS2 • Besi disulfida (mineral sulfida) Sistem kristal: Isometrik (kubus, pyritohedra, kombinasi) Werna: kuningan-kuning (“emas bodho”) • Kilap: metalik Kekerasan: ~6–6.5 • SG: ~5.0 • Goresan: ireng kehijauan...
Pyrite
Pyrite • FeS2 • Besi disulfida (mineral sulfida) Sistem kristal: Isometrik (kubus, pyritohedra, kombinasi) Werna: kuningan-kuning (“emas bodho”) • Kilap: metalik Kekerasan: ~6–6.5 • SG: ~5.0 • Goresan: ireng kehijauan...
Prehnite
Prehnite • Ca2Al(AlSi3O10)(OH)2 — kalsium-aluminium filosilikat Sistem kristal: Orthorhombic • Kebiasaan: botriodal “anggur,” stalaktit, kerak radial, kristal tabular sing arang Mohs: ~6–6.5 • SG: ~2.8–2.95 • Kilap: vitreus nganti mutiara...
Prehnite
Prehnite • Ca2Al(AlSi3O10)(OH)2 — kalsium-aluminium filosilikat Sistem kristal: Orthorhombic • Kebiasaan: botriodal “anggur,” stalaktit, kerak radial, kristal tabular sing arang Mohs: ~6–6.5 • SG: ~2.8–2.95 • Kilap: vitreus nganti mutiara...
Porphyry
Porphyry • Tekstur igneus (fenokristal ing matriks alus) Panyiraman loro tahap: alon → fenokristal • cepet → groundmass aphanitik Fenokristal: feldspar, kuarsa, hornblende, piroksen ± olivin Mohs: ~6 (feldspar) nganti...
Porphyry
Porphyry • Tekstur igneus (fenokristal ing matriks alus) Panyiraman loro tahap: alon → fenokristal • cepet → groundmass aphanitik Fenokristal: feldspar, kuarsa, hornblende, piroksen ± olivin Mohs: ~6 (feldspar) nganti...