Abstract
The research area was the exposed extruded igneous lava rock in Clering which became the mining location of PT Semarang Mineral Pembangunan in Clering, Donorejo, Jepara with an area of ± 11 ha. This study aims to identify and determine the composition of andesite minerals by macroscopic and microscopic, the main oxide compound data, the use of andesite in industrial sector. The lithology consisted of andesite lava textured, plagioclase, leucite, clinopyroxene, sanidine as phenocryst and ground mass in the form of microlithic andesite lava as a trachytic texture. The hardness of lithology tends to be more moderate, it is considered unsuitable for building foundations. Andesite and tuff in the study area are currently being mined to be used as raw material for glass because of high silica content. In the industrial sector, the feldspar minerals for flux glass, and ceramic raw materials with standard of PT Semarang Mineral Pembangunan and SNI ISO 14703: 2011, 1147-1984 and SNI ISO 12543: 2011. The lithology tuff can be utilized in the manufacturing of ceramics due to high silica and felspar content. The lithology andesite can be utilized as rocks flour in the manufacturing of fertilizer due to high natrium, potassium, and magnesium content.
Highlights
The research location is located in Clering, Jepara, Central Java, Indonesia (Fig. 1)
The research location is included in Quarterly Volcanic Region [1] characterized by volcanic morphology such as Genuk Mount cone in the west [2]
Andesite and tuff in the study area are currently being mined to be used as raw material for glass makers because of their very high silica content
Summary
The research location is located in Clering, Jepara, Central Java, Indonesia (Fig. 1). The results of volcanic activity (product of volcanism) by Genuk Mount causes either intrusive rock or extrusive rock to form in some places such as shown in Clering Village, Jepara. The andesite in Ragas Mount located in production field of PT Semarang Mineral Pembangunan in Clering Jepara (Fig. 1) is unique in the form of physical properties of rock where this andesite has the different hardness than another type of andesite that commonly found. There is another type of igneous rock which is tuff located above the andesite
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