Weathering Influence on Properties of Siltstones from Istria, Croatia

Table 1

Mineralogical compositions of siltstone samples of different weathering grades [30].

Sample	Calcite	Quartz	Plagioclase	K-feldspar	Illite	Chlorite	Kaolinite	Mixed-layer clay minerals	Total clay minerals
FR	50	∼5	<5	—	15–20	21		—	∼40
SW	45	∼5	5–10	—	15–20	20			∼40
CW	35	5–10	5–10		∼25	22			∼50
RS	37	5–10	5–10	—	∼30	24			∼55

— indicates no presence of minerals.
Minerals in traces.
Small amount of minerals.