Clasificacion dos minerais_2
Transcript of Clasificacion dos minerais_2
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CLAVE DICOTÓMICA PARA A CLASIFICACIÓN DE MINERAIS. 1.Minerais de brillo metálico ou de aspecto vermello ou terroso
2.Minerais de cores grises, negras ou amarelas 3.Mineral negro, brillante e magnético (comprobao acercando un imán o un trozo de ferro)… MAGNETITA 3.Mineral non magnético
4.Cor gris plomo. moi pesado e brillante ……………………..GALENA 4.Cor amarela latón. exfoliación en cubos ou piritoedros………….PIRITA
2. Minerais de cor vermella ou terroso
5.Aspecto pisolítico (como un agregado de gránulos oscuros en unha matriz máis clara e uniforme …….BAUXITA 5. Aspecto non pisolítico
6.Raia de cor vermella amarronada …………………….OLIXISTO.
6.Raia de cor vermella brilante con puntos dispersos brilantes e metálicos ……………… CINABRIO
1. Minerais de brillo metálico vítreo céreo, etc. ou sin brillo
7. Cristaliza en maclas de cor parda o rosada claro, con aspecto de prisma hexagonal . ……. ARAGONITO
7. Non cristaliza en maclas de aspecto hexagonal
8 Aspecto laminar ou folioso o fibroso
9.Láminas grosas e ríxidas ……………………..XESO FIBROSO ,XESO LAMINAR 9.Láminas moi delgadas e flexibles. Micas
10. Cor blanca ou rosada ………………………… MOSCOVITA l0. Cor negra ……………………………….BIOTITA
8.Aspecto non laminar nin folioso
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8.Aspecto non laminar nin folioso 11.Cor amarela limón ……………………………SOFRE 11.Outras cores
12. Brillo céreo ou nacarado o sin brillo 13. Cores claras
14.Cor rosada…………………….ORTOSA 14.Cor verdosa o negra o clara. Se raia coa uña. Tacto untuoso….TALCO
13. Cores verdes ou azuis intensos. Con aspecto de mancha irregular 15.Cor azul escura…….. AZURITA 15.Cor verde……………… MALAQUITA
12.Brilo vitreo 16. Cor verde claro, frecuentemente asociado ó basalto……….. OLIVINO
16. Outros cores
17. Mineral denso e pesado, cor branca ou rosada clara . …………… BARITINA 17. Sin estas características
18. Cristaliza en cubos uo formas do sistema cúbico 19.Transparente sabor salgado. Se humedece o tocalo……. HALITA 19.Sin estas características, coracións variadas………… FLUORITA
18. Cristaliza en formas xeométricas non cúbicas. 20. Produce efervescencia co ácido clorhídrico.Exfoliación romboédrica. ………. CALCITA 20. Non produce efervescencia co HCl. Varias cores. Moi duro e raia o vidrio……. CUARZO
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Raia marron.Olixisto Raia vermella.Cinabr io
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