GB/T 17412.1-1998Classification and namenclature schemes of the rocks--Classification and namenclature schemes of igneous rock (English PDF)

3 Symbols and abbreviations

4 General principles for the classification and naming of igneous rocks

5 Criteria for the grain size division of igneous rocks

6 Classification of igneous rocks

7 Melilitic rock group

8 Carbonatite group

9 Lamprophyre group

10 Kimberlite group

11 Diabase group

12 Aplite group

13 Pegmatites

14 Charnockite group

15 Plutonic rocks

16 Volcanic lava rocks

17 Subvolcanic rocks

18 Pyroclastic rocks

Foreword

This document was issued on 17 June 1998 by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and has been in force since 1 January 1999.

It is the first edition of this standard.

Classification: ICS 73.010, CCS D10.

About this edition

GB/T 17412.1-1998 is the first edition of this standard. It was issued on 17 June 1998 and has been in force since 1 January 1999.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite GB/T 17412.1-1998 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one from the record of the Standardization Administration.

Classification and status

GB/T 17412.1-1998 is classified under ICS 73.010, in the field of mining and minerals. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.

Its Chinese Standard Classification code is CCS D10. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.

The GB/T prefix marks a recommended national standard. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.