GB/T 17670-2025Unified coding for natural stone (English PDF)

Foreword

This document conforms to GB/T 1.1-2020 "Standardization Work Guidelines Part

1.Structure and Drafting Rules of Standardization Documents". Drafting is scheduled. This document supersedes GB/T 17670-2008 "Unified Numbering System for Natural Stone". Compared with GB/T 17670-2008, this document differs in the following aspects. Aside from structural adjustments and editorial changes, the main technical changes are as follows: --The criteria for classifying stone types have been changed (see 4.1,

3.1 in the.2008 edition). --Added a category for "Other Stones" [see 4.1f)]; --New domestic stone varieties such as Beijing Cherry Blossom and Macheng Sesame White have been added (see Table 1); --New varieties of foreign stone such as Lincoln White and Vientiane Grey have been added (see Appendix B). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Building Materials Federation. This document is under the jurisdiction of the National Technical Committee on Standardization of Stone Materials (SAC/TC 460). This document was drafted by: China National Building Materials Artificial Crystal Research Institute Co., Ltd., China Stone Material Association, Anhui Laoshiren Stone Industry Co., Ltd., and Huanqiu. Stone (Fujian) Co., Ltd., Shenzhen Youren Enterprise Management Consulting Co., Ltd., Guangdong Jinnuode Mining Co., Ltd., Fujian Huahui Stone Industry Co., Ltd., and Macheng City Public Inspection and Testing Center. The main drafters of this document are. Zhou Junxing, Chao Shoumei, Zi Peng, Lin Yuhua, Fang Zhihua, Hu Yuzhong, Zhu Qiumin, Wang Weixuan, and Luo Wei. This document was first published in.1999, revised for the first time in.2008, and this is the second revision. Unified Numbering System for Natural Stone

1 Scope

GB/T 17670-2025 is the Chinese national standard on unified coding for natural stone, in the field of construction materials and building. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 25 April 2025 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 November 2025. Classification: ICS 91.100.15, CCS Q21. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document specifies the classification and naming of natural stone, the principles of numbering, and the names and numbers. This document applies to the naming and numbering of granite, marble, limestone, sandstone, slate, and other stone materials used in building decoration.

5 Numbering Principles

5.1 The unified numbering system for natural stone consists of a stone type code (1 letter), a stone origin code (2 digits), and a sequence number representing the origin of the stone. The code consists of three parts in sequence. two numbers or two letters.

5.2 Stone Type Code. Represents the type of stone, consisting of one English letter.

a) Granite -- G;

c) Limestone -- L;

d) Quartz-based sandstone -- Q;

f) Other stone -- A.

5.3 Stone Origin Code. Represents the origin of domestically produced stone, consisting of 2 digits, according to the provincial, autonomous region, and municipality codes specified in GB/T 2260. See Appendix A for administrative division codes.

5.4 Origin Stone Sequence Code. Represents the serial number of the stone variety belonging to the production area of each province, autonomous region, or municipality, consisting of numbers 0-9 and uppercase letters. The letters A through F can form two numbers or English letters.

6 Name and Number

6.1 The names and unified codes of domestically produced stone materials are shown in Table 1, and their English names are for reference.

6.2 The names and types of imported stone are listed in Appendix B. GB/T 17670-2025. Unified Numbering System for Natural Stone National Standards of the People's Republic of China ICS 91.100.15CCS Q

21 Unified Numbering System for Natural Stone Released on April 25, 2024 Implemented 2025-11-

01 State Administration for Market Regulation The State Administration for Standardization issued a statement. Replaces GB/T 17670-2008