Limestone is by definition a rock that contains at least 50% calcium carbonate in the form of calcite by weight. All limestones contain at least a few percent other materials. These can be small particles of quartz, feldspar, clay minerals, pyrite, siderite and other minerals.
Answers (4) You have not mentioned the name of the medicine in your post. Ideally 4 times a day means every 6 hours. It depends on what the medicine is as to how rigid you should be in regards to dosing. If the medicine is an antibiotic then every 6 hour dosing is important as is pain relief medication if in severe pain. If the dosing isn't so critical then 4 times a day could be evenly spaced out during the waking hours.
1 monophasic 21-day pill â you take a combined pill for 21 days, followed by seven days without pills, when you have a bleed. 2  To delay your period, start a new packet of pills straight after you finish the last pill and miss out the seven-day break. 3  everyday (ED) pill â you take a combined pill every day.