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![Page 1: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/1.jpg)
Representam as relações geométricas existentes entre os diferentes componentes cristalinos duma rochas e o material amorfo (vidro) presente. As texturas definem as seguintes propriedades das rochas:
1) Grau de cristalinidade (grau de cristalização); relação relativa entre vidro e cristais
2) Grau de visibilidade (dimensões granulométricas); tamanho absoluto e relativo dos cristais.
3) Forma dos cristais
4) Relação recíproca o disposição espacial dos cristais e do vidrio
Texturas
![Page 2: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/2.jpg)
As rochas vulcânicas têm uma cristalinidade muito variável desde tipos totalmente constituídos por cristais a tipos completamente constituídos por vidro.
Holocristalino 100% cristais
Hipovítrea o Hipocristalina intermédia
Holovítrea 100% vidro
Texturas
![Page 3: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/3.jpg)
Textura Holocristalina
Olivin-basalto
![Page 4: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/4.jpg)
Textura ipovítrea
![Page 5: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/5.jpg)
Grau de visibilidade
Compreende três diferentes conceitos: 1) o que pode-se ver com olho o com o microscópio; 2) as dimensões absoluta dos cristais; 3) as dimensões relativas dos cristais
Textura fanerítica: todos os minerais são distinguíveis a olho
Textura afanítica; todos os cristais, exceto os fenocristais, são distinguíveis sô com o microscópio
![Page 6: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/6.jpg)
Textura glomeroporfirica
![Page 7: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/7.jpg)
Textura intergranular
![Page 8: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/8.jpg)
Textura intersertal
![Page 9: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/9.jpg)
Textura intersertal
![Page 10: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/10.jpg)
Textura traquítica
![Page 11: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/11.jpg)
Texturaseriada
![Page 12: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/12.jpg)
Textura porfírica (basalto)
![Page 13: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/13.jpg)
Forma dos cristais(olivino)
![Page 14: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/14.jpg)
Textura porfírica (andesite)
![Page 15: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/15.jpg)
Plagioclaso
![Page 16: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/16.jpg)
Textura porfírica (andesite)
![Page 17: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/17.jpg)
Riolito
![Page 18: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/18.jpg)
Basálto nefelínico
![Page 19: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/19.jpg)
Textura amigdoidal
![Page 20: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/20.jpg)
Komatiito (textura spinifex)
![Page 21: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/21.jpg)
Tufo não soldado e soldados
![Page 22: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/22.jpg)
Esferulítas
![Page 23: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/23.jpg)
Vitrofiro
![Page 24: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/24.jpg)
Tefrito
![Page 25: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/25.jpg)
Olivino em basalto
![Page 26: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/26.jpg)
Textura ofítica
![Page 27: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/27.jpg)
Textura inequigranular em Tonalita
![Page 28: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/28.jpg)
Textura inequigranular em Gabbro
![Page 29: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/29.jpg)
Textura inequigranular em Granito
![Page 30: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/30.jpg)
Textura inequigranular em Norito
![Page 31: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/31.jpg)
Classificação
![Page 32: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/32.jpg)
![Page 33: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/33.jpg)
![Page 34: Texturas](https://reader031.fdocuments.net/reader031/viewer/2022012318/5571f20649795947648bffe7/html5/thumbnails/34.jpg)